[22a-P01-1~38] 10 Spintronics and Magnetics (Poster)

[22a-P01-24] Observation of extrinsic anomalous Hall effect in Fe₅GeTe₂

〇Ryuki Suzuki¹, Kazuya Ando^1,2,3 (1.Keio Univ., 2.Keio KiPAS, 3.Keio CSRN)

Keywords:

spintronics,anomalous Hall effect,van der Waals material

Ever since graphene was first discovered by developing a simple mechanical exfoliation method, van der Waals materials have been actively studied. In particular, van der Waals ferromagnetic materials have drawn great attention as building blocks for spintronic devices. So far, Fe₃GeTe₂ has been found to be apromising van der Waals ferromagnetic material with a high Curie temperature (T_C ~ 230 K). Recently, inspired by the itinerant ferromagnetism with even higher Curie temperature, research on a van der Waals ferromagnet Fe₅GeTe₂ (T_C ~ 270 K - 310 K) has become active. In this study, we report a large extrinsic anomalous Hall effect in van der Waals ferromagnet Fe₅GeTe₂ flakes. We found that the extrinsic skew scattering coefficient in the Fe₅GeTe₂ thin films is an order of magnitude larger than that in transition metal ferromagnets. This finding sheds light on the role of the extrinsic mechanism in the anomalous Hall effect in van der Waals ferromagnets.