Magnetic properties of single rare-earth atoms on graphene/Ir(111)

被引：29

作者：

Baltic, Romana ^{[1
]}

Donati, Fabio ^{[1
,2
,3
]}

Singha, Aparajita ^{[1
]}

Waeckerlin, Christian ^{[1
,4
]}

Dreiser, Jan ^{[1
,5
]}

Delley, Bernard ^{[6
]}

Pivetta, Marina ^{[1
]}

Rusponi, Stefano ^{[1
]}

Brune, Harald ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland

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

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

[4] Swiss Fed Labs Mat Sci & Technol, Empa, CH-8600 Dubendolf, Switzerland

[5] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[6] Paul Scherrer Inst, WHGA 123, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 02期

基金：

瑞士国家科学基金会;

关键词：

ANISOTROPY; HYSTERESIS; DICHROISM; VALENCE; ADATOM; MOMENT; FIELD; SPIN;

D O I：

10.1103/PhysRevB.98.024412

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We employed x-ray absorption spectroscopy and x-ray magnetic circular dichroism to study the magnetic properties of single rare-earth (RE) atoms (Nd, Tb, Dy, Ho, and Er) adsorbed on the graphene/Ir(111) surface. The interaction of RE atoms with graphene results for Tb in a trivalent state with 4f(n-1) occupancy, and in a divalent state with 4f(n) occupancy for all other studied RE atoms (n corresponds to the 4f occupancy of free atoms). Among the studied RE on graphene/Ir(111), Dy is the only one that shows magnetic hysteresis and remanence at 2.5 K. By comparing measured spectra and magnetization curves with multiplet calculations, we determine the energy diagram of the magnetic states and show for each element the magnetization reversal process that determines the timescale of its magnetic bistability.

引用

页数：12

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