Dependence of Magnetic Damping on Temperature and Crystal Orientation in Epitaxial Fe4N Thin Films

Isogami, Shinji; Tsunoda, Masakiyo; Oogane, Mikihiko; Sakuma, Atsushi; Takahashi, Madoka

doi:10.3379/msjmag.1406r001

Cited by 13 publications

(13 citation statements)

References 23 publications

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“…Since the effective H might also be affected by H a , the physical meaning of the Δϕ H value is considered to be an index that is proportional to the eld dragging factor. In addition to the above, the ΔH 0 (equivalent to the ΔH total offset) was signi cantly smaller for both the Fe 94 Si 6 and Fe 90 Si 10 lms. Since ΔH 0 is attributed to magnetic inhomogeneity, it is helpful to consider the effects of surface roughness, and Figs.…”

Section: Resultsmentioning

confidence: 73%

“…In the case of the Fe lm, clear crystal grains are observed, with grain diameters of approximately 20 nm, in conjunction with an R a value of 0.5 nm. In contrast, signi cantly smoother surfaces with R a values less than 0.2 nm were obtained for the Fe 94 Si 6 and Fe 90 Si 10 lms. From these images we conclude that the ΔH 0 values obtained in the present study re ected the lower R a values of these lms.…”

Section: Resultsmentioning

confidence: 83%

“…Firstly, with regard to the physical meaning of Δϕ H , it is evident that the Δθ χ50 values of 0.81 and 0.95 associated with the Fe 94 Si 6 and Fe 90 Si 10 lms were too large to t the experimental data ( Fig. 2(c)).…”

Section: Resultsmentioning

confidence: 99%

“…When analyzing the H r and ΔH, we employed the coherent rotation model. 12) This model is not appropriate for the case of FMR data obtained with multiple domain structures, such as were present in the Fe lm, and so only the Fe 94 Si 6 and Fe 90 Si 10 lms were evaluated.…”

Section: Fmr Measurementsmentioning

confidence: 99%

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Anisotropic FMR Linewidths in Epitaxially Grown Si-Doped <i>A</i>2-Fe Thin Films

2016

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A series of 40 nm-thick Fe 100−x Si x (x = 0, 6 or 10 at%) single-crystal lms with an A2 phase were fabricated on MgO(001) substrates. Variations in the ferromagnetic resonant eld (H r ) and linewidth (ΔH) values with changes in the azimuthal angle (ϕ H ) were subsequently evaluated, using an electron cyclotron resonant system with X-band (9.86 GHz) microwaves at room temperature. The H r values exhibited fourfold symmetric behavior while varying the ϕ H . In addition, the ΔH values demonstrated symmetric behavior, with intense peaks in the vicinity of the magnetization hard-axis, and so the ΔH variation was reduced with increasing Si content. An analysis of the data was performed, employing the magnetization coherent rotation model. It was determined that the appearance of strong peaks can be attributed to differences between ϕ H and the magnetization angle (ϕ M ), based on the term [cos. This is believed to result from the insuf cient H r strength obtained during measurements with X-band microwaves relative to the anisotropy elds of the lms.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Fmr Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Anisotropic FMR Linewidths in Epitaxially Grown Si-Doped <i>A</i>2-Fe Thin Films

2016

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“…In ferromagnetic materials, the strength of the spin-orbit interaction is responsible for both the static and dynamic properties of magnetization, for example, a crystalline magnetic anisotropy and magnetization damping. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Thus, similar to the crystalline magnetic anisotropy, one can expect that the Gilbert damping constant governing the magnetization damping will also show a crystallographic anisotropy. However, it is still unclear whether the Gilbert damping constant has crystallographic anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Crystallographic anisotropy of the intrinsic Gilbert damping for single-crystalline Fe film

Kasatani

Nozaki

2015

J. Magn. Soc. Jpn.

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We experimentally investigated the crystallographic anisotropy of the intrinsic Gilbert damping constant in single crystalline Fe(001) film deposited on MgO(001) substrate. The frequency-domain ferromagnetic resonance (FMR) spectrum was measured at given external magnetic fields via a vector network analyzer. From the field-domain FMR linewidth obtained as a function of resonant frequency, the intrinsic Gilbert damping constants along the crystallographic axes in the (001) plane were successfully obtained by evaluating the extrinsic influence of two magnon scattering and inhomogeneity. A four-fold crystalline anisotropy of the intrinsic Gilbert damping constant, similar to the magnetic crystalline anisotropy in the (001) plane, was clearly observed. Furthermore, we found that the intrinsic Gilbert damping constant along the easy axis was smaller than that along the hard axis.

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Antiperovskite Magnetic Materials with 2p Light Elements for Future Practical Applications

Isogami

Takahashi

2022

Adv Elect Materials

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Light elements having 2p electrons such as B, C, and N are common elements that have played an important role in various functional materials. In particular, nitrides have long been used in the development of semiconductors, superconductors, and magnets. More recently, Fe‐ and Mn‐based antiperovskite‐type compounds with light elements have attracted considerable attention in the field of spintronic engineering, because of the development of intriguing and practical applications making them one of the key materials for future devices. In this article, it is first reviewed the evolution of applications and which light elements are employed. Then the representative applications and characteristics of the light elements, including magnetoresistive effects, magnetization switching, current‐spin and thermoelectric conversions, magnetic anisotropy, and domain nucleation are individually highlighted. Additionally, the crystal structure, fundamental properties, and theoretical study are addressed to enable a deeper understanding of the role of light elements in the unit cell. Beyond compounds with N, a demonstration using B and C is discussed to examine their effect on the magnetic structures of antiperovskite compounds. Finally, prospective and future strategies are discussed to build a platform of practical material based on light elements.

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Dependence of Magnetic Damping on Temperature and Crystal Orientation in Epitaxial Fe4N Thin Films

Cited by 13 publications

References 23 publications

Anisotropic FMR Linewidths in Epitaxially Grown Si-Doped <i>A</i>2-Fe Thin Films

Anisotropic FMR Linewidths in Epitaxially Grown Si-Doped <i>A</i>2-Fe Thin Films

Crystallographic anisotropy of the intrinsic Gilbert damping for single-crystalline Fe film

Antiperovskite Magnetic Materials with 2p Light Elements for Future Practical Applications

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