The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Edward Della Torre - One of the best experts on this subject based on the ideXlab platform.
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Demagnetized State dependence of henkel plots i the preisach model
Journal of Applied Physics, 1994Co-Authors: F Vajda, Edward Della Torre, R D McmichaelAbstract:The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the Demagnetized State is often not specified. In this paper, the Demagnetized State dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− Demagnetized States were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the Demagnetized State only.
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Demagnetized‐State dependence of Henkel plots. I. The Preisach model
Journal of Applied Physics, 1994Co-Authors: F Vajda, Edward Della Torre, R D McmichaelAbstract:The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the Demagnetized State is often not specified. In this paper, the Demagnetized State dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− Demagnetized States were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the Demagnetized State only.
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Demagnetized State dependence of henkel plots ii domain wall motion
Journal of Applied Physics, 1994Co-Authors: R D Mcmichael, F Vajda, Edward Della TorreAbstract:The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of Demagnetized States produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly Demagnetized States are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac Demagnetized State deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.
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Demagnetized‐State dependence of Henkel plots. II. Domain wall motion
Journal of Applied Physics, 1994Co-Authors: R D Mcmichael, F Vajda, Edward Della TorreAbstract:The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of Demagnetized States produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly Demagnetized States are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac Demagnetized State deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.
R D Mcmichael - One of the best experts on this subject based on the ideXlab platform.
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Demagnetized State dependence of henkel plots i the preisach model
Journal of Applied Physics, 1994Co-Authors: F Vajda, Edward Della Torre, R D McmichaelAbstract:The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the Demagnetized State is often not specified. In this paper, the Demagnetized State dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− Demagnetized States were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the Demagnetized State only.
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Demagnetized‐State dependence of Henkel plots. I. The Preisach model
Journal of Applied Physics, 1994Co-Authors: F Vajda, Edward Della Torre, R D McmichaelAbstract:The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the Demagnetized State is often not specified. In this paper, the Demagnetized State dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− Demagnetized States were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the Demagnetized State only.
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Demagnetized State dependence of henkel plots ii domain wall motion
Journal of Applied Physics, 1994Co-Authors: R D Mcmichael, F Vajda, Edward Della TorreAbstract:The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of Demagnetized States produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly Demagnetized States are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac Demagnetized State deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.
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Demagnetized‐State dependence of Henkel plots. II. Domain wall motion
Journal of Applied Physics, 1994Co-Authors: R D Mcmichael, F Vajda, Edward Della TorreAbstract:The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of Demagnetized States produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly Demagnetized States are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac Demagnetized State deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.
R Belhi - One of the best experts on this subject based on the ideXlab platform.
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micro magnetic dendritic domain structure in the Demagnetized State of perpendicular magnetic ultrathin film the effect of the width of the distribution of the energy barriers
Journal of Magnetism and Magnetic Materials, 2019Co-Authors: Adanlete A Adjanoh, R BelhiAbstract:Abstract We have used polar Kerr microscopy to study the magnetic domain structure in an ultrathin Au/Co(1 nm)/Au layer with perpendicular magnetic anisotropy. We present our demagnetization method of the sample. In the Demagnetized State, we observed a dendritic domain structure. We theoretically calculated the lateral domain size in the Demagnetized State by using two different models and we saw that the prefactor x = 0.389 corresponds to the domain structure observed. We used polar magneto-optical Kerr effect magnetometry (PMOKE) to study the magnetization reversal and to extract an activation energy E a in zero field and the width of the distribution of the energy barriers σ w . We correlated the dendritic domain structure observed with the large value of σ w .
F Vajda - One of the best experts on this subject based on the ideXlab platform.
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Demagnetized State dependence of henkel plots i the preisach model
Journal of Applied Physics, 1994Co-Authors: F Vajda, Edward Della Torre, R D McmichaelAbstract:The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the Demagnetized State is often not specified. In this paper, the Demagnetized State dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− Demagnetized States were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the Demagnetized State only.
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Demagnetized‐State dependence of Henkel plots. I. The Preisach model
Journal of Applied Physics, 1994Co-Authors: F Vajda, Edward Della Torre, R D McmichaelAbstract:The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the Demagnetized State is often not specified. In this paper, the Demagnetized State dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete‐moving‐hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− Demagnetized States were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the Demagnetized State only.
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Demagnetized State dependence of henkel plots ii domain wall motion
Journal of Applied Physics, 1994Co-Authors: R D Mcmichael, F Vajda, Edward Della TorreAbstract:The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of Demagnetized States produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly Demagnetized States are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac Demagnetized State deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.
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Demagnetized‐State dependence of Henkel plots. II. Domain wall motion
Journal of Applied Physics, 1994Co-Authors: R D Mcmichael, F Vajda, Edward Della TorreAbstract:The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of Demagnetized States produced by ac, dc+, and dc− demagnetization methods as well as microscopically and randomly Demagnetized States are used to calculate mr(H). The resulting collection of Henkel plots contains examples of both ‘‘positive’’ and ‘‘negative’’ deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac Demagnetized State deviates from the square‐root law previously calculated for domain wall pinning using a classical Preisach model.
M Sagawa - One of the best experts on this subject based on the ideXlab platform.
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Relation between domain wall motion and coercivity in Nd-Fe-B sintered magnets prepared in various conditions
IOP Conference Series: Materials Science and Engineering, 2009Co-Authors: Kurima Kobayashi, Y Ochiai, K Hayakawa, M SagawaAbstract:For the study of the relationship between the domain wall motion (DWM) and the coercivity in the samples of Dy-free Nd-Fe-B sintered magnets, the DC susceptibility (• •DC) in the initial magnetization from the thermally Demagnetized State and the DWM in the partially Demagnetized State after the full magnetization in 5T-pulse field were measured. In the high coercivity (μ.Hc) samples of μ.Hc=1.35T and 1.62T, the stronger pinning in initial magnetization was detected as the• •DC compared to other samples of the smaller coercivities such as μ.Hc=0.80T. The former samples also showed little DWM in the partially Demagnetized State even the domain structures were clearly detected by magneto-force microscopy (MFM). In the latter samples, however, the obvious DWM was measured as the differences (ΔM) between the magnetizations under applied field (Ma) and the remanences (Mr) in demagnetization process (ΔM = Mr - Ma). The pinning in DWM in initial magnetization process and the DWM in the partially Demagnetized State are both originated from the interaction between the domain walls and grain boundary phases. The enhancement in coercivity, therefore, should come from the same interactions in the sintered samples.
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Measurements of domain structure reformation temperatures in sintered Dy-free Nd2Fe14B magnets
Journal of Magnetism and Magnetic Materials, 2007Co-Authors: Kurima Kobayashi, K Hayakawa, T. Kohno, M SagawaAbstract:Abstract Temperature dependences of remanences in imperfectly, partially, magnetized Dy-free Nd2Fe14B sintered magnets were measured. The domain structures in Demagnetized and magnetized States were observed by Kerr effect microscopy and by magneto-force microscopy. The remanences in the samples after measurements of minor loops with applying of 0.1–1.6 T static and of 5 T pulse fields are mainly composed of the magnetized grains into single-domain State that are originally multi-domain grains in thermally Demagnetized State. A specific temperature of about 500 K that corresponds to domain structure re-formation in the magnetized grains was detected in the measurements in this study.