Switching of a single atomic spin induced by spin injection: A model calculation

S. Kokado, K. Harigaya, A. Sakuma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Toward the manipulation of a single atomic spin, we theoretically study the switching of a localized quantum spin S=(Sx, Sy, S z) induced by spin injection in electrode/S/electrode junctions. This S has a uniaxial anisotropy energy, - \D\S2z, which shows the bistable potential between Sz= - S and S, with D being an anisotropy constant. Furthermore, S interacts with the atomic vibration. For the initial state of Sz= - S, we consider a situation in which up-spin electrons exhibit the spinflip tunneling from the left electrode to the right one through an exchange interaction between the electron spin and S. Using the master equation approach, we investigate the time t dependence of the current I, the expectation value of Sz, 〈Sz〉, and that of the vibration quantum number, 〈n〉, of an S=2 system, which corresponds to an Fe atom on CuN surface. The systems exhibit the switching or nonswitching depending on the transition probability due to spin-atomic vibration interaction within a period of 10 ns. In addition, the t dependence of I and 〈n〉 is explained on the basis of 〈Sz〉 and the probability distribution.

Original languageEnglish
Title of host publicationProceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages142-145
Number of pages4
ISBN (Print)981428212X, 9789814282123
Publication statusPublished - 2009 Jan 1
Event9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008 - Hatoyama, Saitama, Japan
Duration: 2008 Aug 252008 Aug 28

Publication series

NameProceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008

Other

Other9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
CountryJapan
CityHatoyama, Saitama
Period08/8/2508/8/28

Keywords

  • Atomic memory
  • Single atomic spin
  • Spin switching

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Switching of a single atomic spin induced by spin injection: A model calculation'. Together they form a unique fingerprint.

Cite this