Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session X45: Magnetic Anisotropy: Hard and Soft Materials
11:15 AM–1:51 PM,
Friday, March 6, 2020
Room: 706
Sponsoring
Unit:
GMAG
Chair: Scooter Johnson, U.S. Naval Research Laboratory
Abstract: X45.00010 : Influence of W thickness on Perpendicular Magneto-crystalline Anisotropy of Pt/Co/W(111) Superlattices*
View Presentation Abstract
Presenter:
Huynh Thi Ho
(Univ of Ulsan)
Authors:
Huynh Thi Ho
(Univ of Ulsan)
Sanghoon Kim
(Univ of Ulsan)
Sonny H. Rhim
(Univ of Ulsan)
Soon Cheol Hong
(Univ of Ulsan)
explored in spintronics. Pt/Co/W (111) superlattice is investigated by employing first-principles calculations to clarify experimental results, where perpendicular magnetocrystalline anisotropy (PMA) depends on W thickness. Moreover, the enhancement of PMA with respect to Pt/Co due to non-magnetic W is examined. Our calculation results show that the thickness dependence of PMA is evident, whose maximum occurs when W is three monolayers, where the orbital hybridization at interfaces with W is responsible for PMA. Surprisingly, W contributes to PMA with appreciable orbital magnetic anisotropy, which follows the so-called Bruno relation, EPMA ~ m⊥orb - m∥orb. To clarify the physics origin, PMA is analyzed in the framework of second-order perturbation theory, where 〈m=-2|Lz|m=+2〉 dominates. In addition, k-resolved PMA demonstrates that contribution is from the Γ with d orbitals of m = ±2, where m is the magnetic quantum number.
*National Research Foundation of Korea(NRF) (NRF-2018R1A4A1020696)
Creative Materials Discovery Program through the NRF of Korea (NRF-2015M3D1A1070462)
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