Unconventional Spin Relaxation Involving Localized Vibrational Modes in Ho Single-Atom Magnets

被引：38

作者：

Donati, F. ^{[1
,2
,3
]}

Rusponi, S. ^{[2
]}

Stepanow, S. ^{[4
]}

Persichetti, L. ^{[4
,5
]}

Singha, A. ^{[1
,2
,3
]}

Juraschek, D. M. ^{[4
,6
]}

Wackerlin, C. ^{[2
,7
]}

Baltic, R. ^{[2
]}

Pivetta, M. ^{[2
]}

Diller, K. ^{[2
]}

Nistor, C. ^{[4
]}

Dreiser, J. ^{[8
]}

Kummer, K. ^{[9
]}

Velez-Fort, E. ^{[9
]}

Spaldin, N. A. ^{[4
]}

Brune, H. ^{[2
]}

Gambardella, P. ^{[4
]}

机构：

[1] Inst for Basic Sci Korea, Ctr Quantum Nanosci, Seoul 03760, South Korea

[2] Ecole Polytech Fed Lausanne, Inst Phys, Stn 3, CH-1015 Lausanne, Switzerland

[3] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea

[4] Swiss Fed Inst Technol, Dept Mat, Honggerbergring 64, CH-8093 Zurich, Switzerland

[5] Roma Tre Univ, Dept Sci, I-00146 Rome, Italy

[6] Harvard Univ, Harvard John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[7] Czech Acad Sci, Inst Phys, Cukrovarnicka 10, Prague 16200 6, Czech Republic

[8] PSI, SLS, CH-5232 Villigen, Switzerland

[9] ESRF, F-38043 Grenoble, France

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 07期

基金：

瑞士国家科学基金会;

关键词：

LATTICE-RELAXATION; MOLECULE MAGNET; HIGH-FIELD; MAGNETIZATION; ANISOTROPY; BLOCKING; TEMPERATURE; BISTABILITY; DICHROISM; REMANENCE;

D O I：

10.1103/PhysRevLett.124.077204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the spin relaxation of Ho single atom magnets on MgO/Ag(100) as a function of temperature and magnetic field. We find that the spin relaxation is thermally activated at low field, while it remains larger than 1000 s up to 30 K and 8 T. This behavior contrasts with that of single molecule magnets and bulk paramagnetic impurities, which relax faster at high field. Combining our results with density functional theory, we rationalize this unconventional behavior by showing that local vibrations activate a two-phonon Raman process with a relaxation rate that peaks near zero field and is suppressed at high field. Our work shows the importance of these excitations in the relaxation of axially coordinated magnetic atoms.

引用

页数：6

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