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MA: Fachverband Magnetismus
MA 14: General Spintronics
MA 14.1: Vortrag
Montag, 16. März 2020, 15:00–15:15, HSZ 401
Tunable magnetic anisotropy energy with quantum well state in SrRuO3 — •Angus Huang1, Horng-Tay Jeng1, 2, 3, and Ching-Hao Chang4, 5 — 1Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan — 2Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan — 3Institute of Physics, Academia Sinica, Taipei 11529, Taiwan — 4Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan — 5Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan 70101, Taiwan
We demonstrate theoretically the magnetic anisotropy in SrRuO3 thin film can be well controlled by geometrical and electrical modulations: the easy axis (preferred magnetization direction) can be switched between perpendicular and parallel to the film either by slightly altering the film thickness or by moderately doping electrons. Such an ability is given by the spin-polarized quantum well states (QWSs) near the Fermi level. The QWSs are susceptible to the intrinsic spin orbital interaction and thus drive a large energy discrepancy when a SrRuO3 thin film rotates its magnetization direction. As a result, the low-energy magnetic state can be fine controlled by varying the QWS energy positions via geometry or electricity. The significances of this phenomenon are illustrated in the thin films by the large anisotropy energy induced by the spin-polarized quantum-well resonances, and by the ideal electric control of the easy axis.