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Butterfly-shaped magnetoresistance in triangular-lattice antiferromagnet Ag2CrO2.

ABSTRACT: Spintronic devices using antiferromagnets (AFMs) are promising candidates for future applications. Recently, many interesting physical properties have been reported with AFM-based devices. Here we report a butterfly-shaped magnetoresistance (MR) in a micrometer-sized triangular-lattice antiferromagnet Ag2CrO2. The material consists of two-dimensional triangular-lattice CrO2 layers with antiferromagnetically coupled S?=?3/2 spins and Ag2 layers with high electrical conductivity. The butterfly-shaped MR appears only when the magnetic field is applied perpendicularly to the CrO2 plane with the maximum MR ratio (?15%) at the magnetic ordering temperature. These features are distinct from those observed in conventional magnetic materials. We propose a theoretical model where fluctuations of partially disordered spins with the Ising anisotropy play an essential role in the butterfly-shaped MR in Ag2CrO2.

SUBMITTER: Taniguchi H 

PROVIDER: S-EPMC7018778 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Butterfly-shaped magnetoresistance in triangular-lattice antiferromagnet Ag<sub>2</sub>CrO<sub>2</sub>.

Taniguchi Hiroki H   Watanabe Mori M   Tokuda Masashi M   Suzuki Shota S   Imada Eria E   Ibe Takashi T   Arakawa Tomonori T   Yoshida Hiroyuki H   Ishizuka Hiroaki H   Kobayashi Kensuke K   Niimi Yasuhiro Y  

Scientific reports 20200213 1

Spintronic devices using antiferromagnets (AFMs) are promising candidates for future applications. Recently, many interesting physical properties have been reported with AFM-based devices. Here we report a butterfly-shaped magnetoresistance (MR) in a micrometer-sized triangular-lattice antiferromagnet Ag<sub>2</sub>CrO<sub>2</sub>. The material consists of two-dimensional triangular-lattice CrO<sub>2</sub> layers with antiferromagnetically coupled S = 3/2 spins and Ag<sub>2</sub> layers with hig  ...[more]

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