Nanometre-scale probing of spin waves using single electron spins

Toeno van der Sar, Francesco Casola, Ronald Walsworth and Amir Yacoby ()
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Toeno van der Sar: Harvard University
Francesco Casola: Harvard University
Ronald Walsworth: Harvard University
Amir Yacoby: Harvard University

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Pushing the frontiers of condensed-matter magnetism requires the development of tools that provide real-space, few-nanometre-scale probing of correlated-electron magnetic excitations under ambient conditions. Here we present a practical approach to meet this challenge, using magnetometry based on single nitrogen-vacancy centres in diamond. We focus on spin-wave excitations in a ferromagnetic microdisc, and demonstrate local, quantitative and phase-sensitive detection of the spin-wave magnetic field at ∼50 nm from the disc. We map the magnetic-field dependence of spin-wave excitations by detecting the associated local reduction in the disc’s longitudinal magnetization. In addition, we characterize the spin–noise spectrum by nitrogen-vacancy spin relaxometry, finding excellent agreement with a general analytical description of the stray fields produced by spin–spin correlations in a 2D magnetic system. These complementary measurement modalities pave the way towards imaging the local excitations of systems such as ferromagnets and antiferromagnets, skyrmions, atomically assembled quantum magnets, and spin ice.

Date: 2015
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DOI: 10.1038/ncomms8886

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