TY - JOUR
T1 - Parameter-free determination of the exchange constant in thin films using magnonic patterning
AU - Langer, M.
AU - Wagner, K.
AU - Sebastian, T.
AU - Hübner, R.
AU - Grenzer, J.
AU - Wang, Yutian
AU - Kubota, T.
AU - Schneider, T.
AU - Stienen, S.
AU - Lenz, K.
AU - Schultheiß, H.
AU - Lindner, J.
AU - Takanashi, K.
AU - Arias, R. E.
AU - Fassbender, J.
N1 - Funding Information:
We thank B. Scheumann for the film deposition. Support by the Nanofabrication Facilities Rossendorf at IBC is gratefully acknowledged. R.E.A. thanks CEDENNA FB0807, FONDECYT 1130192 (Chile). This work was funded by the DFG Grant LE2443/5-1.
Publisher Copyright:
© 2016 AIP Publishing LLC.
PY - 2016/3/7
Y1 - 2016/3/7
N2 - An all-electrical method is presented to determine the exchange constant of magnetic thin films using ferromagnetic resonance. For films of 20 nm thickness and below, the determination of the exchange constant A, a fundamental magnetic quantity, is anything but straightforward. Among others, the most common methods are based on the characterization of perpendicular standing spin-waves. These approaches are however challenging, due to (i) very high energies and (ii) rather small intensities in this thickness regime. In the presented approach, surface patterning is applied to a permalloy (Ni80Fe20) film and a Co2Fe0.4Mn0.6Si Heusler compound. Acting as a magnonic crystal, such structures enable the coupling of backward volume spin-waves to the uniform mode. Subsequent ferromagnetic resonance measurements give access to the spin-wave spectra free of unquantifiable parameters and, thus, to the exchange constant A with high accuracy.
AB - An all-electrical method is presented to determine the exchange constant of magnetic thin films using ferromagnetic resonance. For films of 20 nm thickness and below, the determination of the exchange constant A, a fundamental magnetic quantity, is anything but straightforward. Among others, the most common methods are based on the characterization of perpendicular standing spin-waves. These approaches are however challenging, due to (i) very high energies and (ii) rather small intensities in this thickness regime. In the presented approach, surface patterning is applied to a permalloy (Ni80Fe20) film and a Co2Fe0.4Mn0.6Si Heusler compound. Acting as a magnonic crystal, such structures enable the coupling of backward volume spin-waves to the uniform mode. Subsequent ferromagnetic resonance measurements give access to the spin-wave spectra free of unquantifiable parameters and, thus, to the exchange constant A with high accuracy.
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U2 - 10.1063/1.4943228
DO - 10.1063/1.4943228
M3 - Article
AN - SCOPUS:85020173929
SN - 0003-6951
VL - 108
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 10
M1 - 102402
ER -