Long-Lived Ultrafast Spin Precession in Manganese Alloys Films with a Large Perpendicular Magnetic Anisotropy
2011 | journal article. A publication with affiliation to the University of Göttingen.
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Long-Lived Ultrafast Spin Precession in Manganese Alloys Films with a Large Perpendicular Magnetic Anisotropy
Mizukami, S.; Wu, F.; Sakuma, A.; Walowski, J.; Watanabe, D.; Kubota, T. & Zhang, X. et al. (2011)
Physical Review Letters, 106(11) art. 117201. DOI: https://doi.org/10.1103/PhysRevLett.106.117201
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Details
- Authors
- Mizukami, S.; Wu, F.; Sakuma, A.; Walowski, Jakob; Watanabe, D.; Kubota, T.; Zhang, X.; Naganuma, H.; Oogane, Mikihito; Ando, Yasuo; Miyazaki, T.
- Abstract
- Spin precession with frequencies up to 280 GHz is observed in Mn(3-delta)Ga alloy films with a perpendicular magnetic anisotropy constant K(u) similar to 15 Merg/cm(3). The damping constant alpha, characterizing macroscopic spin relaxation and being a key factor in spin-transfer-torque systems, is not larger than 0.008 (0.015) for the delta = 1.46 (0.88) film. Those are about one-tenth of alpha values for known materials with large K(u). First-principles calculations well describe both low alpha and large K(u) for these alloys.
- Issue Date
- 2011
- Status
- published
- Publisher
- Amer Physical Soc
- Journal
- Physical Review Letters
- ISSN
- 0031-9007
- Sponsor
- NEDO; JST; JSPS; Asahi glass foundation; DAAD
