Thermal and Magnetic-Field Stability of Holmium Single-Atom Magnets
- 주제(기타) Physics, Multidisciplinary
- 설명문(일반) [Natterer, Fabian Donat; Donati, Fabio; Patthey, Francois; Brune, Harald] Ecole Polytech Fed Lausanne, Inst Phys, Stn 3, CH-1015 Lausanne, Switzerland; [Donati, Fabio] Inst for Basic Sci Korea, Ctr Quantum Nanosci, Seoul 03760, South Korea; [Donati, Fabio] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 AMER PHYSICAL SOC
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000151900
- 본문언어 영어
- Published As http://dx.doi.org/10.1103/PhysRevLett.121.027201
초록/요약
We use spin-polarized scanning tunneling microscopy to demonstrate that Ho atoms on magnesium oxide exhibit a coercive field of more than 8 T and magnetic bistability for many minutes, both at 35 K. The first spontaneous magnetization reversal events are recorded at 45 K, for which the metastable state relaxes in an external field of 8 T. The transverse magnetic anisotropy energy is estimated from magnetic field and bias voltage dependent switching rates at 4.3 K. Our measurements constrain the possible ground state of Ho single-atom magnets to either J(z) = 7 or 8, both compatible with magnetic bistability at fields larger than 10 mT.
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