Control and local measurement of the spin chemical potential in a magnetic insulator

被引：219

作者：

Du, Chunhui ^{[1
]}

van der Sar, Toeno ^{[1
]}

Zhou, Tony X. ^{[1
,2
]}

Upadhyaya, Pramey ^{[3
]}

Casola, Francesco ^{[1
,4
]}

Zhang, Huiliang ^{[1
,4
]}

Onbasli, Mehmet C. ^{[5
,6
]}

Ross, Caroline A. ^{[5
]}

Walsworth, Ronald L. ^{[1
,4
]}

Tserkovnyak, Yaroslav ^{[3
]}

Yacoby, Amir ^{[1
,2
]}

机构：

[1] Harvard Univ, Dept Phys, 17 Oxford St, Cambridge, MA 02138 USA

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

[3] Univ Calif Los Angeles, Dept Phys & Astron, 475 Portola Plaza, Los Angeles, CA 90095 USA

[4] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[5] MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[6] Koc Univ, Dept Elect & Elect Engn, TR-34450 Istanbul, Turkey

来源：

SCIENCE | 2017年 / 357卷 / 6347期

基金：

瑞士国家科学基金会;

关键词：

ROOM-TEMPERATURE; TRANSPORT; NANOSTRUCTURES; ACCUMULATION; SPINTRONICS; DIAMOND; TORQUE;

D O I：

10.1126/science.aak9611

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The spin chemical potential characterizes the tendency of spins to diffuse. Probing this quantity could provide insight into materials such as magnetic insulators and spin liquids and aid optimization of spintronic devices. Here we introduce single-spin magnetometry as a generic platform for nonperturbative, nanoscale characterization of spin chemical potentials. We experimentally realize this platform using diamond nitrogen-vacancy centers and use it to investigate magnons in a magnetic insulator, finding that the magnon chemical potential can be controlled by driving the system's ferromagnetic resonance. We introduce a symmetry-based two-fluid theory describing the underlying magnon processes, measure the local thermomagnonic torque, and illustrate the detection sensitivity using electrically controlled spin injection. Our results pave the way for nanoscale control and imaging of spin transport in mesoscopic systems.

引用

页码：195 / 198

页数：4

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