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journal article·2021-02-01Open access

Butterfly-shaped magnetoresistance in van der Waals ferromagnet Fe5GeTe2

Tomoharu Ohta, Masashi Tokuda, Shuichi Iwakiri, Kosuke Sakai, Benjamin Driesen, Yoshinori Okada, Kensuke Kobayashi, Yasuhiro Niimi

AIP Advances· Volume 11· Issue 2
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Source abstract

Abstract

We have performed magnetoresistance (MR) measurements on van der Waals ferromagnetic devices using quenched- (Q-) and nonquenched- (NQ-) Fe5GeTe2 crystals. A clear butterfly-shaped hysteresis has been observed for thin-film (less than 6 unit-cell layer) Q- and NQ-Fe5GeTe2 devices, but not for thicker film ones. The switching field of the butterfly-shaped MR is consistent with the coercive filed obtained from the Hall measurements. The MR ratio of the butterfly peak reaches about 10% at maximum, which is much larger than that observed with conventional magnetic materials. Such a large MR ratio would be related to magnetic fluctuations due to the complicated magnetic structure in this material.
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Research context

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Topological Materials and Phenomena

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Affiliations

Department of Physics, Graduate School of Science, Osaka University 1 , Toyonaka, Osaka 560-0043, Japan

Okinawa Institute of Science and Technology Graduate University 2 , Okinawa 904-0495, Japan

Institute for Physics of Intelligence and Department of Physics, The University of Tokyo 3 , Bunkyo-ku, Tokyo 113-0033, Japan

Center for Spintronics Research Network, Osaka University 4 , Toyonaka, Osaka 560-8531, Japan

Funding

Shimadzu Science Foundation · Toyota Riken Scholar · Japan Society for the Promotion of Science · Kato Foundation for Promotion of Science · Mazda Foundation · Yazaki Memorial Foundation for Science and Technology · Support Center for Advanced Telecommunications Technology Research Foundation · Murata Science Foundation

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