The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
B. G. Shen - One of the best experts on this subject based on the ideXlab platform.
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particle size dependent Hysteresis Loss in la0 7ce0 3fe11 6si1 4c0 2 first order systems
Applied Physics Letters, 2012Co-Authors: Liang-yao Chen, J. Wang, L. F. Bao, J. R. Sun, B. G. ShenAbstract:Here, we report particle size dependent Hysteresis Loss in La0.7Ce0.3Fe11.6Si1.4C0.2. Hysteresis Loss was getting smaller with reducing the particle size. The reduced ratio can be as high as ∼61% as the sample is ground from bulk into small particles (20‐50 μm). Such reduction can be ascribed to the notably increased surface area of sample and the partially removed internal strain and grain boundaries, other than nucleation factors and electronic band structure. Meanwhile, entropy change |ΔS| slightly decreases, but the effective refrigeration capacity shows an increase due to the notable reduction of Hysteresis Loss. Our investigations also reveal particle size limitation. When the size is below 10 μm (average ∼ 4 μm), the sample may lose its stability and the |ΔS| notably reduces.
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Particle size dependent Hysteresis Loss in La0.7Ce0.3Fe11.6Si1.4C0.2 first‐order systems
Applied Physics Letters, 2012Co-Authors: Liang-yao Chen, J. Wang, L. F. Bao, J. R. Sun, B. G. ShenAbstract:Here, we report particle size dependent Hysteresis Loss in La0.7Ce0.3Fe11.6Si1.4C0.2. Hysteresis Loss was getting smaller with reducing the particle size. The reduced ratio can be as high as ∼61% as the sample is ground from bulk into small particles (20‐50 μm). Such reduction can be ascribed to the notably increased surface area of sample and the partially removed internal strain and grain boundaries, other than nucleation factors and electronic band structure. Meanwhile, entropy change |ΔS| slightly decreases, but the effective refrigeration capacity shows an increase due to the notable reduction of Hysteresis Loss. Our investigations also reveal particle size limitation. When the size is below 10 μm (average ∼ 4 μm), the sample may lose its stability and the |ΔS| notably reduces.
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reduction of Hysteresis Loss and large magnetocaloric effect in the c and h doped la fe si 13 compounds around room temperature
Journal of Applied Physics, 2012Co-Authors: Hu Zhang, J. R. Sun, B. G. Shen, X Q Zheng, Jie Shen, Yi LongAbstract:The effects of the interstitial C and H atoms on the phase formation, the Hysteresis Loss, and magnetocaloric effects of the NaZn13-type La(Fe, Si)13 compounds are investigated. It is found that the annealing time to obtain a 1:13 structure is significantly reduced from 40 days for LaFe11.7Si1.3 to a week for LaFe11.7Si1.3C0.2. The introduction of C and H atoms can adjust Curie temperature to around room temperature and leads to the decrease in magnetic entropy change (ΔSM) and magnetic Hysteresis Loss due to the weakening of itinerant-electron metamagnetic transition. Large −ΔSM of 19.0 J/kg K at room temperature without Hysteresis Loss for LaFe11.7Si1.3C0.2H1.7 is obtained for a field change of 5 T.
Li Longbiao - One of the best experts on this subject based on the ideXlab platform.
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Damage Monitoring of Unidirectional C/SiC Ceramic-Matrix Composite under Cyclic Fatigue Loading using A Hysteresis Loss Energy-Based Damage Parameter at Room and Elevated Temperatures
Applied Composite Materials, 2015Co-Authors: Li LongbiaoAbstract:The damage evolution of unidirectional C/SiC ceramic-matrix composite (CMC) under cyclic fatigue loading has been investigated using a Hysteresis Loss energy-based damage parameter at room and elevated temperatures. The experimental fatigue Hysteresis modulus and fatigue Hysteresis Loss energy versus cycle number have been analyzed. By comparing the experimental fatigue Hysteresis Loss energy with theoretical computational values, the interface shear stress corresponding to different cycle number and peak stress has been estimated. The experimental evolution of fatigue Hysteresis Loss energy and fatigue Hysteresis Loss energy-based damage parameter versus cycle number has been predicted for unidirectional C/SiC composite at room and elevated temperatures. The predicted results of interface shear stress degradation, stress–strain Hysteresis loops corresponding to different number of applied cycles, fatigue Hysteresis Loss energy and fatigue Hysteresis Loss energy-based damage parameter as a functions of cycle number agreed with experimental data. It was found that the fatigue Hysteresis energy-based parameter can be used to monitor the fatigue damage evolution and predict the fatigue life of fiber-reinforced CMCs.
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Fatigue Hysteresis behavior of unidirectional C/SiC ceramic–matrix composite at room and elevated temperatures
Materials Science and Engineering: A, 2015Co-Authors: Li LongbiaoAbstract:Abstract In this paper, the tensile fatigue Hysteresis behavior of unidirectional C/SiC composite at room and elevated temperatures in air atmosphere has been investigated. The fatigue Hysteresis modulus and fatigue Hysteresis Loss energy corresponding to different number of applied cycles have been analyzed. Based on the damage mechanism of fiber slipping relative to matrix in the interface debonded region, the fatigue Hysteresis loops models based upon the Coulomb friction law instead of a constant fiber/matrix interface shear stress usually assumed in the Hysteresis analysis, have been developed. The relationships between the fatigue Hysteresis Loss energy, fatigue Hysteresis loops, interface frictional slip and interface frictional coefficient have been established. When the fiber/matrix interface frictional coefficient degrades, the fatigue Hysteresis Loss energy first increases to the maximum value, and then decreases to zero; the fatigue Hysteresis loops correspond to different interface frictional slip cases. By comparing the experimental fatigue Hysteresis Loss energy with theoretical computational values, the fiber/matrix interface frictional coefficient corresponding to different number of applied cycles, has been obtained. The variations of fatigue Hysteresis modulus, fatigue Hysteresis Loss energy and interface frictional coefficient as a function of cycle number, have been analyzed for different fatigue peak stresses and test conditions. The fatigue Hysteresis loops predicted using the Hysteresis loops models and estimated fiber/matrix interface frictional coefficient agreed with experimental results.
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assessment of the interfacial properties from fatigue Hysteresis Loss energy in ceramic matrix composites with different fiber preforms at room and elevated temperatures
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Li LongbiaoAbstract:Abstract The fiber/matrix interface shear stress is a key parameter in the fatigue behavior of fiber-reinforced ceramic-matrix composites (CMCs). In this paper, the interface shear stress of three CMCs with different carbon fiber preforms, i.e., unidirectional C/SiC, cross-ply C/SiC and 2.5D woven C/SiC, has been estimated from fatigue Hysteresis Loss energy at room and elevated temperatures. Under fatigue loading, the fatigue Hysteresis Loss energy and fatigue Hysteresis modulus versus the applied cycles have been analyzed. The theoretical relationships between the fatigue Hysteresis loops, the fatigue Hysteresis Loss energy, the interface slip and the interface shear stress have been established. When the interface shear stress degrades, the fatigue Hysteresis Loss energy first increases to the maximum value, then decreases to zero; the fatigue Hysteresis loops correspond to different interface slip cases. By comparing the experimental fatigue Hysteresis Loss energy with theoretical computational values, the evolution of the interface shear stress versus the applied cycles of C/SiC composites has been analyzed. The effects of fiber preforms and test conditions on the interface shear stress degradation have been investigated. The fatigue Hysteresis loops of unidirectional, cross-ply and 2.5D woven C/SiC composites have been predicted for different applied cycles at room and elevated temperatures.
M. Takahashi - One of the best experts on this subject based on the ideXlab platform.
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study on the magnetic microstructures for conipt thin film media by rotational Hysteresis Loss analysis
IEEE Translation Journal on Magnetics in Japan, 1993Co-Authors: M. Suekane, T. Shimatsu, M. Miyamura, M. TakahashiAbstract:The magnetic microstructures in CoNiPt thin film media with coercivities ranging from 800 Oe to 1800 Oe were studied through rotational Hysteresis Loss analyses. In order to investigate the mechanism for the observed increase in coercivity, H c was analyzed as a function of H k (2?), H k grain and H p , determined by magnetic torque measurements. Here H k (2?) is the macroscopically induced uniaxial anisotropy field in the film plane, H k grain is the magnetic field for which the rotational Hysteresis Loss W r vanishes in the high magnetic field region, and H p is the magnetic field at which W r is maximum. According to the results, H c increases with H p , remaining slightly higher than H p , while H k (2?) and H k grain showed no systematic change and remained almost constant. These experimental facts suggest that H c for these samples is mainly determined by the magnetization reversal of exchange-coupled crystallites, and H c increases as a consequence of the reduction of intergranular exchange coupling. This behavior corresponds closely to the reduction in medium noise.
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Perpendicular magnetic anisotropy and rotational Hysteresis Loss in Co-Cr films☆
Journal of Magnetism and Magnetic Materials, 1993Co-Authors: I.m. Song, Shunji Ishio, M. Ishizuka, T. Tsunoda, M. TakahashiAbstract:Abstract Magnetic properties (Curie temperature, magnetization, magnetic anisotropy and rotational Hysteresis Loss) of Co 100− x Cr x films (18 ⩽ x ⩽ 22) and bulk alloys (0 ⩽ × ⩽ 24) were measured to make clear the origin of the perpendicular magnetic anisotropy in Co-Cr films. The magnetization, magnetic anisotropy and rotational Hysteresis Loss in films are discussed by taking account of the dispersion of the magnetic anisotropy due to a microscopic compositional inhomogeneity. The rotational Hysteresis Loss of bubble materials such as YFeO 3 and Sm 0.4 Y 2.6 Fe 3.8 Ga 1.2 O 12 are also investigated and compared with that of the Co-Cr film.
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Magnetization reversal mechanism evaluated by rotational Hysteresis Loss analysis for the thin film media
IEEE Transactions on Magnetics, 1992Co-Authors: M. Takahashi, T. Shimatsu, M. Suekane, M. Miyamura, K. Yamaguchi, H. YamasakiAbstract:Rotational Hysteresis Loss analysis has been carried out for CoCrTa, CoNiPt, and CoCrPt thin-film media to evaluate the influence of microstructure on coercive force through the measurement of magnetic anisotropy. In each medium, the magnitudes of H/sub k//sup grain/ defined as a magnetic field where rotational Hysteresis Loss W/sub r/ diminishes remain almost a constant value independently of the values of coercive force. With increasing coercive force, the magnitude of the coercive force gradually becomes smaller than that of the switching field of magnetization H/sub p/ evaluated by torque analysis. Through the analysis of H/sub k//sup grain/ and H/sub p/, it is suggested that the coercive force in each examined medium is strongly dependent on the degree of intergranular exchange coupling and/or magnetostatic interactions. While on CoNiPt and CoCrPt media coercive force depends on the rotational Hysteresis integral, no correlation between them was observed in CoCrTa films.
Bao-gen Shen - One of the best experts on this subject based on the ideXlab platform.
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novel reduction of Hysteresis Loss controlled by strain memory effect in ferh pmn pt heterostructures
Nano Energy, 2019Co-Authors: Kaiming Qiao, Yao Liu, Hao Kuang, Hongrui Zhang, Jing Wang, Jirong Sun, Wenhui Liang, Bao-gen ShenAbstract:Abstract As living standards increase, the energy consumption in refrigeration, such as air-conditioning and refrigerators, tremendously increases and intensifies global warming. As an alternative for the conventional vapor compression technique, solid state refrigeration based on magnetocaloric effect shows significant potential due to energy-saving and environmental-friendly properties. However, Hysteresis Loss is a longstanding problem seriously harming refrigeration efficiency. Here, we report novel enhancement of refrigeration efficiency controlled by strain memory effect in FeRh films grown on (011)-PMN-PT substrates. Utilizing nonvolatile strain triggered by a pulse electric field to engineer magnetization process of FeRh film, a nonvolatile large reduction of Hysteresis Loss, ∼56%, is achieved, consequently effective refrigeration capacity increases to ∼86%. The Hysteresis Loss can be expected to be eliminated and even turned out to be inverse through enhancing the strain memory effect. As a result, effective refrigeration capacity (RCeffe) can increase to a new height through introducing external mechanical work in a magnetic refrigeration cycle, and the ideal COP (coefficient-of-performance) would break through Carnot limit if only Hysteresis Loss and the contribution of mechanical work were considered.
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Novel reduction of Hysteresis Loss controlled by strain memory effect in FeRh/PMN-PT heterostructures
Nano Energy, 2019Co-Authors: Kaiming Qiao, Yao Liu, Hao Kuang, Hongrui Zhang, Liang Wenhui, Jing Wang, Jirong Sun, Bao-gen ShenAbstract:Abstract As living standards increase, the energy consumption in refrigeration, such as air-conditioning and refrigerators, tremendously increases and intensifies global warming. As an alternative for the conventional vapor compression technique, solid state refrigeration based on magnetocaloric effect shows significant potential due to energy-saving and environmental-friendly properties. However, Hysteresis Loss is a longstanding problem seriously harming refrigeration efficiency. Here, we report novel enhancement of refrigeration efficiency controlled by strain memory effect in FeRh films grown on (011)-PMN-PT substrates. Utilizing nonvolatile strain triggered by a pulse electric field to engineer magnetization process of FeRh film, a nonvolatile large reduction of Hysteresis Loss, ∼56%, is achieved, consequently effective refrigeration capacity increases to ∼86%. The Hysteresis Loss can be expected to be eliminated and even turned out to be inverse through enhancing the strain memory effect. As a result, effective refrigeration capacity (RCeffe) can increase to a new height through introducing external mechanical work in a magnetic refrigeration cycle, and the ideal COP (coefficient-of-performance) would break through Carnot limit if only Hysteresis Loss and the contribution of mechanical work were considered.
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reduction of magnetic Hysteresis Loss in la0 5pr0 5fe11 4si1 6hx hydrides with large magnetocaloric effects
Journal of Applied Physics, 2010Co-Authors: Jinliang Zhao, Jirong Sun, Jun Shen, Bao-gen ShenAbstract:Magnetic properties and magnetocaloric effects (MCEs) have been investigated in hydrogenated La0.5Pr0.5Fe11.4Si1.6Hx (x=0, 0.9, and 1.6) compounds. It is found that the Curie temperature TC can be tuned from 189 to 317 K by adjusting hydrogen content from 0 to 1.6. It is attractive that both thermal and magnetic Hysteresis are remarkably reduced because of the weakness of the itinerant-electron metamagnetic transition after hydrogenation, while the large magnetic entropy change is retained. The maximal Hysteresis Loss at TC decreases from 17.8 to 2.3 J/kg as x increases from 0 to 1.6. For the samples with x=0, 0.9, and 1.6, the maximal values of −ΔS are 26.3, 24.1, and 22.1 J/kg K at TC, with efficient refrigeration capacities of 463, 366, and 351 J/kg for a field change of 0–5 T, respectively. Large reversible MCE and small Hysteresis with considerable value of refrigeration capacity indicate the potentiality of La0.5Pr0.5Fe11.4Si1.6Hx hydrides as a candidate magnetic refrigerant around room temperature.
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influence of the substitution of cu for si on magnetic entropy change and Hysteresis Loss in lafe11 7 si1 xcux 1 3 compounds
Journal of Applied Physics, 2009Co-Authors: B. Gao, Jirong Sun, Jun Shen, Junzhuan Wang, Bao-gen ShenAbstract:The magnetic properties, magnetic entropy change, and Hysteresis Loss in LaFe11.7(Si1−xCux)1.3 compounds were investigated. It was found that the compounds retain the cubic NaZn13 structure when the substitution of Cu reaches 20%. With increasing Cu content from x=0 to 0.2, the Curie temperature TC increases from 185 to 200 K, while lattice parameter decreases from 11.475 to 11.468 due to the smaller atomic radius of Cu than Si. Metamagnetic behavior becomes weaker and magnetic entropy change |ΔS| drops with raising Cu content. However, |ΔS| still remains a large value, ∼20 J/kg K, when x reaches 0.2. An attractive feature is that both thermal and magnetic Hysteresis can be remarkably reduced by introducing Cu. The maximum Hysteresis Loss at TC drops from 74.1 to 0 J /kg when the substitution of Cu for Si increases from 0% to 20%.
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reduction of Hysteresis Loss and large magnetic entropy change in the nazn13 type laprfesic interstitial compounds
Applied Physics Letters, 2007Co-Authors: Jun Shen, Jirong Sun, Bin Gao, H W Zhang, Bao-gen ShenAbstract:Magnetic properties and magnetic entropy change of the NaZn13-type La0.5Pr0.5Fe11.5Si1.5Cx compounds have been investigated. Both the lattice parameter and the Curie temperature increase linearly with increasing carbon concentration. The maximum Hysteresis Loss at TC reduces remarkably from 94.8J∕kg for x=0to23.1J∕kg for x=0.3 because of the weakening of the itinerant electron metamagnetic transition. However, the magnetic entropy change remains at the large values of 32.4J∕kgK for x=0 and 27.6J∕kgK for x=0.3 under a field change of 0–5T, which implies that a large magnetocaloric effect and a small Hysteresis Loss have been simultaneously achieved in the La0.5Pr0.5Fe11.5Si1.5Cx carbides.
Jirong Sun - One of the best experts on this subject based on the ideXlab platform.
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novel reduction of Hysteresis Loss controlled by strain memory effect in ferh pmn pt heterostructures
Nano Energy, 2019Co-Authors: Kaiming Qiao, Yao Liu, Hao Kuang, Hongrui Zhang, Jing Wang, Jirong Sun, Wenhui Liang, Bao-gen ShenAbstract:Abstract As living standards increase, the energy consumption in refrigeration, such as air-conditioning and refrigerators, tremendously increases and intensifies global warming. As an alternative for the conventional vapor compression technique, solid state refrigeration based on magnetocaloric effect shows significant potential due to energy-saving and environmental-friendly properties. However, Hysteresis Loss is a longstanding problem seriously harming refrigeration efficiency. Here, we report novel enhancement of refrigeration efficiency controlled by strain memory effect in FeRh films grown on (011)-PMN-PT substrates. Utilizing nonvolatile strain triggered by a pulse electric field to engineer magnetization process of FeRh film, a nonvolatile large reduction of Hysteresis Loss, ∼56%, is achieved, consequently effective refrigeration capacity increases to ∼86%. The Hysteresis Loss can be expected to be eliminated and even turned out to be inverse through enhancing the strain memory effect. As a result, effective refrigeration capacity (RCeffe) can increase to a new height through introducing external mechanical work in a magnetic refrigeration cycle, and the ideal COP (coefficient-of-performance) would break through Carnot limit if only Hysteresis Loss and the contribution of mechanical work were considered.
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Novel reduction of Hysteresis Loss controlled by strain memory effect in FeRh/PMN-PT heterostructures
Nano Energy, 2019Co-Authors: Kaiming Qiao, Yao Liu, Hao Kuang, Hongrui Zhang, Liang Wenhui, Jing Wang, Jirong Sun, Bao-gen ShenAbstract:Abstract As living standards increase, the energy consumption in refrigeration, such as air-conditioning and refrigerators, tremendously increases and intensifies global warming. As an alternative for the conventional vapor compression technique, solid state refrigeration based on magnetocaloric effect shows significant potential due to energy-saving and environmental-friendly properties. However, Hysteresis Loss is a longstanding problem seriously harming refrigeration efficiency. Here, we report novel enhancement of refrigeration efficiency controlled by strain memory effect in FeRh films grown on (011)-PMN-PT substrates. Utilizing nonvolatile strain triggered by a pulse electric field to engineer magnetization process of FeRh film, a nonvolatile large reduction of Hysteresis Loss, ∼56%, is achieved, consequently effective refrigeration capacity increases to ∼86%. The Hysteresis Loss can be expected to be eliminated and even turned out to be inverse through enhancing the strain memory effect. As a result, effective refrigeration capacity (RCeffe) can increase to a new height through introducing external mechanical work in a magnetic refrigeration cycle, and the ideal COP (coefficient-of-performance) would break through Carnot limit if only Hysteresis Loss and the contribution of mechanical work were considered.
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reduction of magnetic Hysteresis Loss in la0 5pr0 5fe11 4si1 6hx hydrides with large magnetocaloric effects
Journal of Applied Physics, 2010Co-Authors: Jinliang Zhao, Jirong Sun, Jun Shen, Bao-gen ShenAbstract:Magnetic properties and magnetocaloric effects (MCEs) have been investigated in hydrogenated La0.5Pr0.5Fe11.4Si1.6Hx (x=0, 0.9, and 1.6) compounds. It is found that the Curie temperature TC can be tuned from 189 to 317 K by adjusting hydrogen content from 0 to 1.6. It is attractive that both thermal and magnetic Hysteresis are remarkably reduced because of the weakness of the itinerant-electron metamagnetic transition after hydrogenation, while the large magnetic entropy change is retained. The maximal Hysteresis Loss at TC decreases from 17.8 to 2.3 J/kg as x increases from 0 to 1.6. For the samples with x=0, 0.9, and 1.6, the maximal values of −ΔS are 26.3, 24.1, and 22.1 J/kg K at TC, with efficient refrigeration capacities of 463, 366, and 351 J/kg for a field change of 0–5 T, respectively. Large reversible MCE and small Hysteresis with considerable value of refrigeration capacity indicate the potentiality of La0.5Pr0.5Fe11.4Si1.6Hx hydrides as a candidate magnetic refrigerant around room temperature.
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influence of the substitution of cu for si on magnetic entropy change and Hysteresis Loss in lafe11 7 si1 xcux 1 3 compounds
Journal of Applied Physics, 2009Co-Authors: B. Gao, Jirong Sun, Jun Shen, Junzhuan Wang, Bao-gen ShenAbstract:The magnetic properties, magnetic entropy change, and Hysteresis Loss in LaFe11.7(Si1−xCux)1.3 compounds were investigated. It was found that the compounds retain the cubic NaZn13 structure when the substitution of Cu reaches 20%. With increasing Cu content from x=0 to 0.2, the Curie temperature TC increases from 185 to 200 K, while lattice parameter decreases from 11.475 to 11.468 due to the smaller atomic radius of Cu than Si. Metamagnetic behavior becomes weaker and magnetic entropy change |ΔS| drops with raising Cu content. However, |ΔS| still remains a large value, ∼20 J/kg K, when x reaches 0.2. An attractive feature is that both thermal and magnetic Hysteresis can be remarkably reduced by introducing Cu. The maximum Hysteresis Loss at TC drops from 74.1 to 0 J /kg when the substitution of Cu for Si increases from 0% to 20%.
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effect of substitution of co for fe on the magnetic Hysteresis Loss and the refrigerant capacity in the la0 5pr0 5fe11 5si1 5 compounds
Journal of Applied Physics, 2009Co-Authors: Jun Shen, Jirong SunAbstract:Magnetic Hysteresis Loss and refrigerant capacity of the NaZn13-type La0.5Pr0.5Fe11.5−xCoxSi1.5 (0⩽x⩽1.0) compounds have been investigated. The substitution of Co in the La0.5Pr0.5Fe11.5Si1.5 causes the order of phase transition at TC to change from first order to second order at x=0.6. Although the magnetic entropy change decreases with increasing Co concentration, the Hysteresis Loss at TC also reduces remarkably from 94.8J∕kg for x=0to1.8J∕kg for x=0.4 because an increase in Co content can weaken the itinerant electron metamagnetic transition. The effective refrigerant capacity remains at a high value ranging from 355to433J∕kg for a field change of 0–5T as x varies from 0 to 1.0.