Switching of Dirac-Fermion Mass at the Interface of Ultrathin Ferromagnet and Rashba Metal

K. Honma, T. Sato, S. Souma, K. Sugawara, Y. Tanaka, T. Takahashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We have performed spin- and angle-resolved photoemission spectroscopy on tungsten (110) interfaced with an ultrathin iron (Fe) layer to study an influence of ferromagnetism on the Dirac-cone-like surface-interface states. We found an unexpectedly large energy gap of 340 meV at the Dirac point, and have succeeded in switching the Dirac-fermion mass by controlling the direction of Fe spins (in plane or out of plane) through tuning the thickness of the Fe overlayer or adsorbing oxygen on it. Such a manipulation of Dirac-fermion mass via the magnetic proximity effect opens a promising platform for realizing new spintronic devices utilizing a combination of exchange and Rashba-spin-orbit interactions.

Original languageEnglish
Article number266401
JournalPhysical review letters
Volume115
Issue number26
DOIs
Publication statusPublished - 2015 Dec 23

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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