Long-lived ultrafast spin precession in manganese alloys films with a large perpendicular magnetic anisotropy

S. Mizukami, F. Wu, A. Sakuma, J. Walowski, D. Watanabe, T. Kubota, X. Zhang, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

Research output: Contribution to journalArticlepeer-review

245 Citations (Scopus)

Abstract

Spin precession with frequencies up to 280 GHz is observed in Mn 3-δGa alloy films with a perpendicular magnetic anisotropy constant Ku∼15Merg/cm3. The damping constant α, characterizing macroscopic spin relaxation and being a key factor in spin-transfer-torque systems, is not larger than 0.008 (0.015) for the δ=1.46 (0.88) film. Those are about one-tenth of α values for known materials with large Ku. First-principles calculations well describe both low α and large Ku for these alloys.

Original languageEnglish
Article number117201
JournalPhysical review letters
Volume106
Issue number11
DOIs
Publication statusPublished - 2011 Mar 16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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