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Tuning the Exchange Bias on a Single Atom from 1 mT to 10 T

Title
Tuning the Exchange Bias on a Single Atom from 1 mT to 10 T
Authors
Yang, KaiPaul, WilliamNatterer, Fabian D.Lado, Jose L.Bae, YujeongWillke, PhilipChoi, TaeyoungFerron, AlejandroFernandez-Rossier, JoaquinHeinrich, Andreas J.Lutz, Christopher P.
Ewha Authors
Andreas Heinrich최태영
Issue Date
2019
Journal Title
PHYSICAL REVIEW LETTERS
ISSN
0031-9007JCR Link

1079-7114JCR Link
Citation
PHYSICAL REVIEW LETTERS vol. 122, no. 22
Publisher
AMER PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Document Type
Article
Abstract
Shrinking spintronic devices to the nanoscale ultimately requires localized control of individual atomic magnetic moments. At these length scales, the exchange interaction plays important roles, such as in the stabilization of spin-quantization axes, the production of spin frustration, and creation of magnetic ordering. Here, we demonstrate the precise control of the exchange bias experienced by a single atom on a surface, covering an energy range of 4 orders of magnitude. The exchange interaction is continuously tunable from milli-eV to micro-eV by adjusting the separation between a spin-1/2 atom on a surface and the magnetic tip of a scanning tunneling microscope. We seamlessly combine inelastic electron tunneling spectroscopy and electron spin resonance to map out the different energy scales. This control of exchange bias over a wide span of energies provides versatile control of spin states, with applications ranging from precise tuning of quantum state properties, to strong exchange bias for local spin doping. In addition, we show that a time-varying exchange interaction generates a localized ac magnetic field that resonantly drives the surface spin. The static and dynamic control of the exchange interaction at the atomic scale provides a new tool to tune the quantum states of coupled-spin systems.
DOI
10.1103/PhysRevLett.122.227203
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자연과학대학 > 물리학전공 > Journal papers
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