First-principles insight into all-optical spin switching in the half-metallic Heusler ferrimagnet Mn2RuGa

Zhang, Guo Ping; Bai, Y. H.; Si, M. S.; George, Thomas F.

doi:10.1103/physrevb.105.054431

Title: First-principles insight into all-optical spin switching in the half-metallic Heusler ferrimagnet Mn2 RuGa

Journal Article · 24 February 2022 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.105.054431 · OSTI ID:1959057

^[1]; Bai, Y. H. ^[2]; Si, M. S. ^[3]; George, Thomas F. ^[4]

Indiana State Univ., Terre Haute, IN (United States); Indiana State University
Indiana State Univ., Terre Haute, IN (United States)
Lanzhou Univ. (China)
Univ. of Missouri, St. Louis, MO (United States)

All-optical spin switching (AOS) represents a new frontier in magnetic storage technology—spin manipulation without a magnetic field—but its underlying working principle is not well understood. Many AOS ferrimagnets such as GdFeCo are amorphous and renders the high-level first-principles study unfeasible. The crystalline half-metallic Heusler Mn₂RuGa presents an opportunity. Here we carry out hitherto the comprehensive density functional investigation into the material properties of Mn₂RuGa, and introduce two concepts—the spin anchor site and the optical active site—as two pillars for AOS in ferrimagnets. In Mn₂RuGa, Mn(4a) serves as the spin anchor site, whose band is below the Fermi level and has a strong spin moment, while Mn(4c) is the optical active site whose band crosses the Fermi level. Our magneto-optical Kerr spectrum and band structure calculation jointly reveal that the delicate competition between the Ru-4d and Ga-4p states is responsible for the creation of these two sites. Furthermore these two sites found here not only present a unified picture for both Mn₂RuGa and GdFeCo, but also open the door for future applications. Specifically, we propose a Mn₂Ru_x Ga-based magnetic tunnel junction where a single laser pulse can control magnetoresistance.

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Research Organization:: Indiana State Univ., Terre Haute, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Engineering & Technology

Grant/Contract Number:: AC02-05CH11231; FG02-06ER46304

OSTI ID:: 1959057

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: First-principles insight into all-optical spin switching in the half-metallic Heusler ferrimagnet Mn2 RuGa

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