Comparison of the in-plane coercive field and anomalous Nernst effect between a co-sputtered Sm–Co amorphous film and Sm/Co multilayer amorphous films with various layer thicknesses

Modak, Rajkumar; Zhou, Weinan; SAKURABA, Yuya; Uchida, K.

doi:10.35848/1882-0786/acd103

Cited by 1 publication

(1 citation statement)

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“…4. Power law scaling of electrical conductivities of amorphous TbFeCo thin films, plotted together with the data for various ferromagnets including transition metals (Ni, Gd, Fe, and Co thin films), 10,30 Mn 3 Sn, 18 MnSi, 31 Fe 1Àx Co x Si, 31 Co 3 Sn 2 S 2 , 32 perovskite oxides(Cu 1Àx Zn x Cr 2 Se 4 , Nd 2 (MoNb) 2 O 7 ), 28 magnetic semiconductor (Ga 1Àx Mn x As, In 1Àx Mn x As), 28 and amorphous materials (a-SmCo, 33,34 a-Fe-Sn 35 ).…”

Section: Resultsmentioning

confidence: 99%

Composition dependence of anomalous Nernst effect in amorphous TbFeCo thin films with perpendicular magnetic anisotropy

Ando,

Komine

2024

Journal of Applied Physics

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In this study, we systematically investigated the anomalous Nernst effect in perpendicularly magnetized amorphous TbFeCo thin films with various compositions. It was found that the magnitude of the off diagonal thermopower (ODT), which corresponds to the anomalous Nernst effect, can be uniformly explained with respect to the Tb content regardless of the concentration above or below the compensation composition. The maximum ODT of 1.3 μV/K and the thermoelectric conductivity of 1.59 A/mK at room temperature were obtained, which is more significant than other perpendicular magnetic anisotropy thin films to achieve a large Nernst voltage for roll-type thermoelectric devices. By considering the thermoelectric tensor, Mott’s equation, and the scaling law, it was shown both experimentally and theoretically that the magnitudes of the first and second terms contributing to the anomalous Nernst effect are comparable. It was also found that the ODT of TbFeCo thin films is twice or more significant than the product of the Seebeck coefficient and the Hall angle. Furthermore, amorphous metals and Mn-alloys with a large Berry curvature are located above the relation that the ODT is twice the product of the Seebeck coefficient and the Hall angle, which means that amorphous metals are expected to enhance the ANE.

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