Magnetic Moment Formation in Graphene Detected by Scattering of Pure Spin Currents

被引：241

作者：

McCreary, Kathleen M. ^{[1
]}

Swartz, Adrian G. ^{[1
]}

Han, Wei ^{[1
]}

Fabian, Jaroslav ^{[2
]}

Kawakami, Roland K. ^{[1
]}

机构：

[1] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[2] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 18期

基金：

美国国家科学基金会;

关键词：

ROOM-TEMPERATURE FERROMAGNETISM; POINT-DEFECTS; TRANSPORT;

D O I：

10.1103/PhysRevLett.109.186604

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Hydrogen adatoms are shown to generate magnetic moments inside single layer graphene. Spin transport measurements on graphene spin valves exhibit a dip in the nonlocal spin signal as a function of the applied magnetic field, which is due to scattering (relaxation) of pure spin currents by exchange coupling to the magnetic moments. Furthermore, Hanle spin precession measurements indicate the presence of an exchange field generated by the magnetic moments. The entire experiment including spin transport is performed in an ultrahigh vacuum chamber, and the characteristic signatures of magnetic moment formation appear only after hydrogen adatoms are introduced. Lattice vacancies also demonstrate similar behavior indicating that the magnetic moment formation originates from p(z)-orbital defects.

引用

页数：5

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