The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
G M Muralikrishna - One of the best experts on this subject based on the ideXlab platform.
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Composition Dependence of tracer diffusion coefficients in fe ga alloys a case study by a tracer interdiffusion couple method
Acta Materialia, 2020Co-Authors: G M Muralikrishna, Bengu Tas, Neelamegan Esakkiraja, Vladimir A Esin, K Hari C Kumar, I S Golovin, Irina V Belova, G E Murch, Aloke PaulAbstract:Abstract The problem of estimation of the tracer diffusion coefficients is solved by utlizing a novel tracer-interdiffusion couple technique even in the absence of a suitable radioisotope of one of the components and absence of reliable thermodynamic parameters. This is demonstrated by generating reliable and reproducible mobility data in the alloys of the Fe–Ga system with a strong Composition Dependence of the diffusion coefficients. Tracer- (59Fe) and inter-diffusion are simultaneously measured in three couples Fe/Fe-16Ga, Fe/Fe-24Ga and Fe-16Ga/Fe-24Ga at 1143 K. The results obtained for the couples with different end-members are in an excellent agreement with each other for the overlapping Composition intervals. The influence of the molar volume on the measured tracer- (59Fe) and inter-diffusion coefficients is evaluated. Using thermodynamic calculations, the Ga tracer diffusion coefficient and the vacancy wind factor are determined via the Darken-Manning relation for the Composition range of 0-24 at.% Ga. The results confirm the reliability of the tracer-interdiffusion couple technique for producing highly accurate diffusion data, in the present case for optimizing the mobility description of the bcc phase of the Fe-Ga system. The Ga tracer diffusion coefficients are further estimated via experimental determination of the ratio of the Fe and Ga tracer diffusivities at the Kirkendall marker planes and utilizing the Fe tracer diffusion coefficients measured directly by the radiotracer method.
Shunsuke Fukami - One of the best experts on this subject based on the ideXlab platform.
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Composition Dependence of spin orbit torque in pt1 xmnx cofeb heterostructures
Applied Physics Letters, 2020Co-Authors: Vihanga K De Zoysa, Yutaro Takeuchi, Hideo Ohno, Samik Duttagupta, Ryuichi Itoh, Shunsuke FukamiAbstract:We investigate spin–orbit torques (SOTs) in heterostructures with Pt1−xMnx alloy and CoFeB as a function of Mn Composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies ( ξ SL and ξ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ξ SL up to 0.21 is obtained at x = 0.20. Compared to the x Dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.
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Composition Dependence of spin−orbit torque in Pt1−xMnx/CoFeB heterostructures
Applied Physics Letters, 2020Co-Authors: K. Vihanga De Zoysa, Yutaro Takeuchi, Hideo Ohno, Samik Duttagupta, Ryuichi Itoh, Shunsuke FukamiAbstract:We investigate spin–orbit torques (SOTs) in heterostructures with Pt1−xMnx alloy and CoFeB as a function of Mn Composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies ( ξ SL and ξ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ξ SL up to 0.21 is obtained at x = 0.20. Compared to the x Dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.
Aloke Paul - One of the best experts on this subject based on the ideXlab platform.
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Composition Dependence of tracer diffusion coefficients in fe ga alloys a case study by a tracer interdiffusion couple method
Acta Materialia, 2020Co-Authors: G M Muralikrishna, Bengu Tas, Neelamegan Esakkiraja, Vladimir A Esin, K Hari C Kumar, I S Golovin, Irina V Belova, G E Murch, Aloke PaulAbstract:Abstract The problem of estimation of the tracer diffusion coefficients is solved by utlizing a novel tracer-interdiffusion couple technique even in the absence of a suitable radioisotope of one of the components and absence of reliable thermodynamic parameters. This is demonstrated by generating reliable and reproducible mobility data in the alloys of the Fe–Ga system with a strong Composition Dependence of the diffusion coefficients. Tracer- (59Fe) and inter-diffusion are simultaneously measured in three couples Fe/Fe-16Ga, Fe/Fe-24Ga and Fe-16Ga/Fe-24Ga at 1143 K. The results obtained for the couples with different end-members are in an excellent agreement with each other for the overlapping Composition intervals. The influence of the molar volume on the measured tracer- (59Fe) and inter-diffusion coefficients is evaluated. Using thermodynamic calculations, the Ga tracer diffusion coefficient and the vacancy wind factor are determined via the Darken-Manning relation for the Composition range of 0-24 at.% Ga. The results confirm the reliability of the tracer-interdiffusion couple technique for producing highly accurate diffusion data, in the present case for optimizing the mobility description of the bcc phase of the Fe-Ga system. The Ga tracer diffusion coefficients are further estimated via experimental determination of the ratio of the Fe and Ga tracer diffusivities at the Kirkendall marker planes and utilizing the Fe tracer diffusion coefficients measured directly by the radiotracer method.
Hideo Ohno - One of the best experts on this subject based on the ideXlab platform.
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Composition Dependence of spin orbit torque in pt1 xmnx cofeb heterostructures
Applied Physics Letters, 2020Co-Authors: Vihanga K De Zoysa, Yutaro Takeuchi, Hideo Ohno, Samik Duttagupta, Ryuichi Itoh, Shunsuke FukamiAbstract:We investigate spin–orbit torques (SOTs) in heterostructures with Pt1−xMnx alloy and CoFeB as a function of Mn Composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies ( ξ SL and ξ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ξ SL up to 0.21 is obtained at x = 0.20. Compared to the x Dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.
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Composition Dependence of spin−orbit torque in Pt1−xMnx/CoFeB heterostructures
Applied Physics Letters, 2020Co-Authors: K. Vihanga De Zoysa, Yutaro Takeuchi, Hideo Ohno, Samik Duttagupta, Ryuichi Itoh, Shunsuke FukamiAbstract:We investigate spin–orbit torques (SOTs) in heterostructures with Pt1−xMnx alloy and CoFeB as a function of Mn Composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies ( ξ SL and ξ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ξ SL up to 0.21 is obtained at x = 0.20. Compared to the x Dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.
Samik Duttagupta - One of the best experts on this subject based on the ideXlab platform.
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Composition Dependence of spin orbit torque in pt1 xmnx cofeb heterostructures
Applied Physics Letters, 2020Co-Authors: Vihanga K De Zoysa, Yutaro Takeuchi, Hideo Ohno, Samik Duttagupta, Ryuichi Itoh, Shunsuke FukamiAbstract:We investigate spin–orbit torques (SOTs) in heterostructures with Pt1−xMnx alloy and CoFeB as a function of Mn Composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies ( ξ SL and ξ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ξ SL up to 0.21 is obtained at x = 0.20. Compared to the x Dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.
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Composition Dependence of spin−orbit torque in Pt1−xMnx/CoFeB heterostructures
Applied Physics Letters, 2020Co-Authors: K. Vihanga De Zoysa, Yutaro Takeuchi, Hideo Ohno, Samik Duttagupta, Ryuichi Itoh, Shunsuke FukamiAbstract:We investigate spin–orbit torques (SOTs) in heterostructures with Pt1−xMnx alloy and CoFeB as a function of Mn Composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies ( ξ SL and ξ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ξ SL up to 0.21 is obtained at x = 0.20. Compared to the x Dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.
