Effect of Doping Elements on the Damping Constant of $({\hbox {Ni-Fe}})_{1-{ x}}{\hbox {M}}_{ x}$ (${\hbox {M}}={\hbox {Ga}}$, Ag, Mo, and W) Films

Endo, Yasushi; Mitsuzuka, Yoshio; Shimada, Yutaka; Yamaguchi, Masahiro

doi:10.1109/tmag.2012.2199742

Cited by 6 publications

(1 citation statement)

References 18 publications

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“…The capability of tuning the damping for a material with such a technological importance as Py is important for the development of possible new devices in spintronics and magnonics. The understanding of how transition metals or rare earth dopants can affect the properties of Py has been the focus of a number of recent experimental studies [5][6][7][8][9] . Typically in these studies, the ferromagnetic resonance 10 (FMR) technique is employed and α and M s are extracted from the linewidth of the uniform precession mode while A is extracted from the first perpendicular standing spin-wave mode 11,12 .…”

Section: Introductionmentioning

confidence: 99%

Systematic study of magnetodynamic properties at finite temperatures in doped permalloy from first-principles calculations

et al. 2016

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By means of first principles calculations, we have systematically investigated how the magnetodynamic properties Gilbert damping, magnetization and exchange stiffness are affected when permalloy (Py) (Fe0.19Ni0.81) is doped with 4d or 5d transition metal impurities. We find that the trends in the Gilbert damping can be understood from relatively few basic parameters such as the density of states at the Fermi level, the spin-orbit coupling and the impurity concentration. The temperature dependence of the Gilbert damping is found to be very weak which we relate to the lack of intraband transitions in alloys. Doping with 4d elements has no major impact on the studied Gilbert damping, apart from diluting the host. However, the 5d elements have a profound effect on the damping and allows it to be tuned over a large interval while maintaining the magnetization and exchange stiffness. As regards spin stiffness, doping with early transition metals results in considerable softening, whereas late transition metals have a minor impact. Our result agree well with earlier calculations where available. In comparison to experiments, the computed Gilbert damping appears slightly underestimated while the spin stiffness show good general agreement.

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Section: Introductionmentioning

confidence: 99%

Systematic study of magnetodynamic properties at finite temperatures in doped permalloy from first-principles calculations

et al. 2016

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Study on measurement technique for magnetization dynamics of thin films

Endo

Mori²,

Shimada

et al. 2018

Applied Physics Letters

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This paper describes our proposed measurement technique for the magnetization dynamics in thin films, which employs a microstripe line probe to detect ferromagnetic resonance (FMR) spectra for a film sample either with or without tensile stress. By measurement of FMR frequency shifts using Lorentzian fits to the FMR spectra for a film with and without tensile stress, saturation magnetostriction (λs) can be determined. The measured values were compared with those estimated by the optical cantilever method using the same samples in good agreement. At the same time, a Gilbert damping constant (α) was determined using both the FMR frequency and the FMR linewidth for the tensile stress free film. The results of the experiment demonstrate that our proposed measurement technique allows for more precise evaluation of magnetization dynamics by providing information on both α and λs simultaneously for an individual sample.

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Evaluation of the magnetization dynamics in various thick YIG films using our proposed measurement technique

Nguyen

Endo

2022

AIP Advances

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This paper describes the evaluation of magnetization dynamics in YIG polycrystalline films with various thicknesses using our proposed measurement technique. The saturation magnetostriction ( λs) are approximately less than −1.0×10−6 regardless of the film thickness and are lower than that of bulk polycrystalline YIG, which might be attributed to the structural and/or magnetic inhomogeneities. On the other hand, the in-plane effective damping constant ( αeff) decreases approximately from 0.00384±0.00029 to 0.00316±0.00013 with the increase of film thickness, and their values are much higher than those of nano-meter thick and micro-meter thick YIG films deposited on GGG substrates. The reason for this difference may be that the extrinsic damping originating from the magnetic inhomogeneities are enhanced in the film plane. In addition, αeff slightly increases as λs decreases. This tendency is opposite to those of Ni-Fe and Fe-Si polycrystalline films, and the correlation between αeff and λs does not appear. Therefore, these results suggest that magnetic inhomogeneities are mainly influenced to both αeff and λs in the film plane.

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Effect of Doping Elements on the Damping Constant of $({\hbox {Ni-Fe}})_{1-{ x}}{\hbox {M}}_{ x}$ (${\hbox {M}}={\hbox {Ga}}$, Ag, Mo, and W) Films

Cited by 6 publications

References 18 publications

Systematic study of magnetodynamic properties at finite temperatures in doped permalloy from first-principles calculations

Systematic study of magnetodynamic properties at finite temperatures in doped permalloy from first-principles calculations

Study on measurement technique for magnetization dynamics of thin films

Evaluation of the magnetization dynamics in various thick YIG films using our proposed measurement technique

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