Ferromagnetic resonance in a two-layer exchange-coupled ferromagnetic film with a combined uniaxial and cubic anisotropy in the layers

We develop an advanced analytical model for calculating the broadband stripline ferromagnetic resonance (FMR) response for metallic ferromagnetic films, taking into account the exchange interaction as well as the exchange boundary conditions at the film surface. This approach leads to simple analytical expressions in the Fourier space. As a result, a numerical code which implements inverse Fourier transform of these equations is very quick. This allows us to explore a wide space of parameters as numerical examples of application of this theory. In particular, we investigate the joint effects of microwave eddy current shielding and magnetization pinning at the ferromagnetic film surfaces on the shape of the stripline FMR response of the film.

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Eigenmodes in thin ferromagnetic film under ferromagnetic resonance and spin-wave resonance conditions at different spin pinning

Physica Scripta ◽

10.1088/0031-8949/91/2/025802 ◽

2016 ◽

Vol 91 (2) ◽

pp. 025802 ◽

Cited By ~ 3

Author(s):

D V Perov ◽

A B Rinkevich ◽

S O Demokritov

Keyword(s):

Spin Wave ◽

Ferromagnetic Resonance ◽

Ferromagnetic Film ◽

Thin Ferromagnetic Film ◽

Spin Wave Resonance ◽

Wave Resonance

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The magnetoelastic coefficients h 3 and h 4 of (100) nickel films

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1972.0068 ◽

1972 ◽

Vol 328 (1572) ◽

pp. 49-65 ◽

Cited By ~ 9

Keyword(s):

Single Crystal ◽

Saturation Magnetization ◽

Ferromagnetic Resonance ◽

Room Temperature ◽

Magnetocrystalline Anisotropy ◽

Anisotropy Constant ◽

Published Data ◽

Nickel Films ◽

Splitting Factor ◽

Cubic Anisotropy

New values have been obtained for the magnetoelastic coefficients h 3 and h 4 of nickel at room temperature from ferromagnetic resonance experiments on (100) single crystal nickel films. The ratios of h 3 / h 1 and h 4 / h 1 are found to be 0.091 ± 0.007 and 0.153 ± 0.015 respectively which give h 3 = (- 8.5 ± 0.7) x 10 -6 and h 4 = (- 14.3 ± 1.4) x 10 -6 if the Lee & Asgar value of h 3 is used (- 94 x 10 -6 ). The magnetocrystalline anisotropy constant K 1 , the saturation magnetization M and the spectroscopic splitting factor g have been measured also. It is found that K 1 = ( - 5.4 ± 0.3) x 10 4 erg/cm 3 and that g = 2.161 ± 0.009 in agreement with published data on bulk samples but that the value of M is found to be higher than the bulk value by 1.6%. The discrepancies between the values of h 3 , h 4 and M as reported here and the bulk values are discussed. The theory of feromagnetic resonance has been extended to cover the five-constant representation of magnetostriction and to the K 3 anisotropy term. The effect of the g factor having cubic anisotropy on the resonance conditions has been calculated.

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Detection of ferromagnetic resonance from 1 nm-thick Co

Scientific Reports ◽

10.1038/s41598-020-72760-7 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Shugo Yoshii ◽

Ryo Ohshima ◽

Yuichiro Ando ◽

Teruya Shinjo ◽

Masashi Shiraishi

Keyword(s):

Buffer Layer ◽

Ferromagnetic Resonance ◽

Smooth Surface ◽

Ferromagnetic Film ◽

Ferromagnetic Films ◽

The Way

Abstract To explore the further possibilities of nanometer-thick ferromagnetic films (ultrathin ferromagnetic films), we investigated the ferromagnetic resonance (FMR) of 1 nm-thick Co film. Whilst an FMR signal was not observed for the Co film grown on a SiO2 substrate, the insertion of a 3 nm-thick amorphous Ta buffer layer beneath the Co enabled the detection of a salient FMR signal, which was attributed to the smooth surface of the amorphous Ta. This result implies the excitation of FMR in an ultrathin ferromagnetic film, which can pave the way to controlling magnons in ultrathin ferromagnetic films.

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