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

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Título: Tuning the Exchange Bias on a Single Atom from 1 mT to 10 T
Autor/es: Yang, Kai | Paul, William | Natterer, Fabian D. | Lado, Jose L. | Bae, Yujeong | Willke, Philip | Choi, Taeyoung | Ferrón, Alejandro | Fernández-Rossier, Joaquín | Heinrich, Andreas J. | Lutz, Christopher P.
Grupo/s de investigación o GITE: Grupo de Nanofísica
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Física Aplicada
Palabras clave: Exchange bias | Single atom | Quantum states | Coupled-spin systems
Área/s de conocimiento: Física de la Materia Condensada
Fecha de publicación: 6-jun-2019
Editor: American Physical Society
Cita bibliográfica: Physical Review Letters. 2019, 122: 227203. doi:10.1103/PhysRevLett.122.227203
Resumen: 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.
Patrocinador/es: We gratefully acknowledge financial support from the Office of Naval Research. W. P. thanks the Natural Sciences and Engineering Research Council of Canada for fellowship support. F. D. N. appreciates support from the Swiss National Science Foundation under Projects No. PZ00P2_167965 and No. PP00P2_176866. A. F. acknowledges CONICET (PIP11220150100327) and FONCyT (PICT-2012-2866). Y. B., P.W., T. C., and A. J.H acknowledge support from Institute for Basic Science IBS-R027-D1. J. L. L. acknowledges support from the ETH Fellowship program. J.F-R. thanks FCT under the project “PTDC/FIS-NAN/4662/2014” as well as Generalitat Valenciana funding Prometeo2017/139 and MINECO Spain (Grant No. MAT2016-78625-C2).
URI: http://hdl.handle.net/10045/93167
ISSN: 0031-9007 (Print) | 1079-7114 (Online)
DOI: 10.1103/PhysRevLett.122.227203
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2019 American Physical Society
Revisión científica: si
Versión del editor: https://doi.org/10.1103/PhysRevLett.122.227203
Aparece en las colecciones:INV - Grupo de Nanofísica - Artículos de Revistas

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