journal article·2021-02-23Open access

Anisotropic Spin Distribution and Perpendicular Magnetic Anisotropy in a Layered Ferromagnetic Semiconductor (Ba,K)(Zn,Mn)2As2

Shoya Sakamoto, Guoqiang Zhao, Goro Shibata, Zheng Deng, Kan Zhao, Xiancheng Wang, Yosuke Nonaka, Keisuke Ikeda, Zhendong Chi, Yuxuan Wan, Masahiro Suzuki, Tsuneharu Koide, Arata Tanaka, Sadamichi Maekawa, Yasutomo J. Uemura, Changqing Jin, Atsushi Fujimori

Abstract

High Resolution Image Download MS PowerPoint Slide The perpendicular magnetic anisotropy of a layered ferromagnetic semiconductor (Ba,K)(Zn,Mn) 2 As 2 is studied using angle-dependent X-ray magnetic circular dichroism (XMCD) measurements. The large magnetic anisotropy with an anisotropy field of 0.85 T is deduced by fitting the Stoner–Wohlfarth model to the magnetic-field-angle dependence of the projected magnetic moment. Transverse XMCD spectra highlight the anisotropic distribution of Mn 3d electrons, where the d xz and d yz orbitals are less populated than the d xy state because of the D 2d splitting that arises from the elongated MnAs 4 tetrahedra. The magnetic anisotropy originates from the degeneracy lifting of p–d xz, d yz hybridized states at the Fermi level. Namely, spin–orbit coupling lifts their degeneracy and induces energy gain when spins align along the z direction. The present system offers another tuning knob to control magnetic anisotropy through atomic orbital engineering.
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Research context

OpenAlex topics: Iron-based superconductors research · Rare-earth and actinide compounds · Heusler alloys: electronic and magnetic properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

The Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan

Department of Quantum Matter, Graduate School of Advanced Sciences of Matter (ADSM), Hiroshima University, Higashi-Hiroshima 739-8530, Japan

RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan

Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China

Department of Physics, Columbia University, New York, New York 10027, United States

Department of Applied Physics, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan

Funding

Ministry of Education, Culture, Sports, Science and Technology · Japan Society for the Promotion of Science · Division of Materials Research

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