Influence of tantalum underlayer on magnetization dynamics in Ni{sub 81}Fe{sub 19} films

Journal Article · Mon Jul 13 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4926612· OSTI ID:22483187

Kwon, Jae Hyun; Deorani, Praveen; Yoon, Jungbum; Yang, Hyunsoo ^[1]; Hayashi, Masamitsu ^[2]

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1. Department of Electrical and Computer Engineering and NUSNNI, National University of Singapore, Singapore 117576 (Singapore)
2. National Institute for Materials Science, Tsukuba 305–0047 (Japan)

The effect of tantalum (Ta) underlayer is investigated in Ni{sub 81}Fe{sub 19} thin films for magnetization dynamics. The damping parameters extracted from spin wave measurements increase systematically with increasing Ta thickness, whereas the damping parameters from ferromagnetic resonance measurements are found to be weakly dependent on the Ta thickness. The difference is attributed to propagating properties of spin wave and short spin diffusion length in Ta. The group velocity of spin waves is found to be constant for different Ta thicknesses, and nonreciprocity of spin waves is not affected by the Ta thickness. The experimental observations are supported by micromagnetic simulations.

• OSTI ID: 22483187
• Journal Information: Applied Physics Letters, Vol. 107, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DAMPING
DIFFUSION LENGTH
FERROMAGNETIC RESONANCE
MAGNETIZATION
SIMULATION
SPIN WAVES
TANTALUM
THICKNESS
THIN FILMS
VELOCITY