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Temperature dependent anomalous Hall effect and anomalous Nernst effect in perpendicularly magnetized [CoSiB/Pt] multilayer film

Gautam, Praveen,Sharma, Pradeep Raj,Kim, Y.K.,Kim, T.W.,Noh, Hwayong North-Holland Pub. Co 2018 Journal of magnetism and magnetic materials Vol.446 No.-
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Abstract We report experiments on the temperature dependence of anomalous Hall and anomalous Nernst effects in amorphous [CoSiB/Pt] multilayer films with perpendicular magnetic anisotropy down to low temperatures. The Hall resistance decreases slowly with decrease in temperature, remaining at about 88% of the room temperature value at 25K. On the other hand, the Nernst coefficient decreases rapidly with decreasing temperature and becomes about 10% of the room temperature value even at 100K. The coercive field determined from these measurements also shows a strong change with temperature, increasing by a factor of two at 25K as compared with that at room temperature. Highlights <UL> <LI> Anomalous Hall and anomalous Nernst effects are measured in [CoSiB/Pt] films. </LI> <LI> Temperature dependences of the two effects show clear distinction. </LI> <LI> Sharp decrease of Nernst effect can be understood from Mott relation. </LI> </UL>
2
CoSiB/Pt 수직자기 다층박막에서 비정상 홀저항의 비단조적 온도의존성과 스케일링

Praveen Gautam,노화용,김태완 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.4
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Anomalous Hall effect is investigated in perpendicular magnetic CoSiB/Pt multilayers with different layer structures. The anomalous Hall resistivity shows a non-monotonic temperature dependence for certain series of structures whereas the longitudinal resistivity always decreases monotonically with decreasing temperature. For those samples with non-monotonic temperature dependence, the conventional power-law scaling with a single dominant mechanism does not hold between the anomalous Hall resistivity and the longitudinal resistivity. An empirical scaling, which includes several contributions together such as skew scattering, side jump, and the intrinsic contributions, appears to be invalid as well when only the impurity effect is considered for the skew scattering. The anomalous Hall resistivity of the multilayers is well fitted with a new scaling where the temperature-dependent phonon skew scattering is included. This is in direct contradiction to the theoretical studies, which predict a negligibly small phonon contribution to the skew scattering, but supports more recent experimental results that evinced the phonon skew scattering. The relative magnitudes of the phonon skew-scattering with respect to the sum of the impurity skew scattering and the side jump fall into a narrow range for all the samples studied.