Ferromagnetism and giant magnetoresistance in zinc-blende FeAs monolayers embedded in semiconductor structures

Le Duc Anh (), Taiki Hayakawa, Yuji Nakagawa, Hikari Shinya, Tetsuya Fukushima, Masaki Kobayashi, Hiroshi Katayama-Yoshida, Yoshihiro Iwasa and Masaaki Tanaka ()
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Le Duc Anh: The University of Tokyo
Taiki Hayakawa: The University of Tokyo
Yuji Nakagawa: QPEC & Dept. of Applied Physics, The University of Tokyo
Hikari Shinya: Tohoku University
Tetsuya Fukushima: Osaka University
Masaki Kobayashi: The University of Tokyo
Hiroshi Katayama-Yoshida: The University of Tokyo
Yoshihiro Iwasa: QPEC & Dept. of Applied Physics, The University of Tokyo
Masaaki Tanaka: The University of Tokyo

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Material structures containing tetrahedral FeAs bonds, depending on their density and geometrical distribution, can host several competing quantum ground states ranging from superconductivity to ferromagnetism. Here we examine structures of quasi two-dimensional (2D) layers of tetrahedral Fe-As bonds embedded with a regular interval in a semiconductor InAs matrix, which resembles the crystal structure of Fe-based superconductors. Contrary to the case of Fe-based pnictides, these FeAs/InAs superlattices (SLs) exhibit ferromagnetism, whose Curie temperature (TC) increases rapidly with decreasing the InAs interval thickness tInAs (TC ∝ tInAs−3), and an extremely large magnetoresistance up to 500% that is tunable by a gate voltage. Our first principles calculations reveal the important role of disordered positions of Fe atoms in the establishment of ferromagnetism in these quasi-2D FeAs-based SLs. These unique features mark the FeAs/InAs SLs as promising structures for spintronic applications.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24190-w

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DOI: 10.1038/s41467-021-24190-w

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