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Determination of the exchange constant of Tb0.3Dy0.7Fe2 by broadband ferromagnetic resonance spectroscopy

Published

Author(s)

Daniel B. Gopman, June W. Lau, Kotekar P. Mohanchandra, Kyle Wetzlar, Greg Carman

Abstract

We present measurements of the exchange stiffness D and the exchange constant A of a sputtered 80 nm Tb0.3Dy0.7Fe2 film. Using a broadband ferromagnetic resonance setup in a wide frequency range from 10 GHz to 50 GHz, multiple perpendicular standing spin-wave resonances were observed with the external static magnetic field applied in–plane. The field corresponding to the strongest resonance peak at each frequency is used to determine the effective magnetization, the g–factor and the Gilbert damping. Furthermore, the dependence of spin-wave mode on field-position is observed for several frequencies. The analysis of spin-wave resonance spectra at multiple frequencies allows us to determine D = (2.79 ± 0.02) · 10−17 T · m2 for an 80 nm thick film. From this, we calculated A = (9.1 ± 0.1)pJ · m−1.
Citation
Physical Review B
Volume
93

Keywords

exchange, magnetostriction, ferromagnetic resonance

Citation

Gopman, D. , Lau, J. , Mohanchandra, K. , Wetzlar, K. and Carman, G. (2016), Determination of the exchange constant of Tb0.3Dy0.7Fe2 by broadband ferromagnetic resonance spectroscopy, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.93.064425 (Accessed March 4, 2024)
Created February 23, 2016, Updated November 10, 2018