Stoichiometry–Induced Ferromagnetism in Altermagnetic Candidate MnTe

Chilcote, Michael; Mazza, Alessandro R.; Lu, Qiangsheng; Gray, Isaiah; Tian, Qi; Deng, Qinwen; Moseley, Duncan; Chen, An‐Hsi; Lapano, Jason; Gardner, Jason S.; Eres, Gyula; Ward, T. Zac; Feng, Erxi; Cao, Huibo; Lauter, Valeria; McGuire, Michael A.; Hermann, Raphael; Parker, David; Han, Myung‐Geun; Kayani, Asghar; Rimal, Gaurab; Wu, Liang; Charlton, Timothy R.; Moore, Robert G.; Brahlek, Matthew

doi:10.1002/adfm.202405829

Title: Stoichiometry–Induced Ferromagnetism in Altermagnetic Candidate MnTe

Journal Article · 07 June 2024 · Advanced Functional Materials

DOI: https://doi.org/10.1002/adfm.202405829 · OSTI ID:2403446

Chilcote, Michael ^[1]; Mazza, Alessandro R. ^[2]; Lu, Qiangsheng ^[1]; Gray, Isaiah ^[3]; Tian, Qi ^[3]; Deng, Qinwen ^[3]; Moseley, Duncan ^[1]; Chen, An‐Hsi ^[1]; Lapano, Jason ^[1]; Gardner, Jason S. ^[1]; Eres, Gyula ^[1]; Ward, T. Zac ^[1]; Feng, Erxi ^[1]; Cao, Huibo ^[1]; Lauter, Valeria ^[1]; McGuire, Michael A. ^[1]; Hermann, Raphael ^[1]; Parker, David ^[1];

^[4]; Kayani, Asghar ^[5] more »

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Pennsylvania, Philadelphia, PA (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Western Michigan Univ., Kalamazoo MI (United States)

The field of spintronics has seen a surge of interest in altermagnetism due to novel predictions and many possible applications. MnTe is a leading altermagnetic candidate that is of significant interest across spintronics due to its layered antiferromagnetic structure, high Neel temperature (T_N ≈ 310 K) and semiconducting properties. The results on molecular beam epitaxy (MBE) grown MnTe/InP(111) films are presented. Here, it is found that the electronic and magnetic properties are driven by the natural stoichiometry of MnTe. Electronic transport and in situ angle-resolved photoemission spectroscopy show the films are natively metallic with the Fermi level in the valence band and the band structure is in good agreement with first-principles calculations for altermagnetic spin-splitting. Neutron diffraction confirms that the film is antiferromagnetic with planar anisotropy and polarized neutron reflectometry indicates weak ferromagnetism, which is linked to a slight Mn-richness that is intrinsic to the MBE-grown samples. Further, when combined with the anomalous Hall effect, this work shows that the electronic response is strongly affected by the ferromagnetic moment. Altogether, this highlights potential mechanisms for controlling altermagnetic ordering for diverse spintronic applications.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); National Quantum Information Science (QIS) Research Centers (United States). The Quantum Science Center (QSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); US Army Research Office (ARO); National Science Foundation (NSF)

Grant/Contract Number:: SC0012704; 89233218CNA000001

OSTI ID:: 2403446

Alternate ID(s):: OSTI ID: 2434359

Report Number(s):: BNL--225825-2024-JAAM

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 46 Vol. 34; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
altermagnetism
MnTe
molecular beam epitaxy
quantum materials
spintronics

Title: Stoichiometry–Induced Ferromagnetism in Altermagnetic Candidate MnTe

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