Spin-wave resonance as a tool for probing surface anisotropies in ferromagnetic thin films: Application to the study of (Ga,Mn)As

Puszkarski, H.; Tomczak, P.

doi:10.1016/j.surfrep.2017.09.001

Cited by 13 publications

(8 citation statements)

References 61 publications

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“…Авторы [34] Важным фактором, при проведении интерпретации спектров, являлась интенсивность выделенных мод. Интенсивность неоднородных спиновых мод зависит от толщины образца, а также величины и знака константы поверхностной анизотропии [21]. Поведение угловой зависимости определяется величиной отклонения поля одноосной анизотропии от нормали пленки [39,40].…”

Section: экспериментальные результаты и обсуждениеunclassified

“…Точность определения каждого из указанных выше магнитных параметров в значительной степени зависит от точности определения резонансного поля ФМР и от корректности идентификации регистрируемых мод в неоднородном ФМР. Так, анализ спектров СВЧ-поглощения в тонких пленках требует учета ряда параметров -это граничные условия [18][19][20][21], толщина ферромагнитной пленки [22], влияющая на соотношение интенсивностей между поверхностной модой и модой стоячей спиновой волны, а также, для мультислойных пленок, композиционный состав [23][24][25][26], определяющий распределение магнитного параметра по толщине пленки, и структурные параметры (толщина и количество отдельных слоев) [3,27]. Правила нумерации стоячих спиновых мод, регистрируемых в СВР-спектре, достаточно подробно изложены в работах [3,22,[28][29][30][31].…”

Section: Introductionunclassified

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Ферромагнитный и спин-волновой резонанс в тонкой пленке (30 nm) сверхрешетки [CoFe/Cu]-=SUB=-N-=/SUB=-

Vazhenina¹,

Исхаков²,

Рауцкий³

et al. 2020

Физика Твердого Тела

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Angular dependencies of the spectrum microwave absorption for the multilayer (CoFe/Cu)N film were studied by ferromagnetic and spin-wave resonance method. The critical angle which indicate the boundaries of ranges where the uniform and non-uniform spin modes are excited, the type of boundary conditions, the values of surface anisotropy constant and exchange interaction were defined in this work. It was shown that the precision of identification of every mode in SWR spectrum is key factor to analyze the measured curves

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Section: экспериментальные результаты и обсуждениеunclassified

Section: Introductionunclassified

Ферромагнитный и спин-волновой резонанс в тонкой пленке (30 nm) сверхрешетки [CoFe/Cu]-=SUB=-N-=/SUB=-

Vazhenina¹,

Исхаков²,

Рауцкий³

et al. 2020

Физика Твердого Тела

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show abstract

“…Above analysis accounts for the isotropic exchange stiffness, A, as commonly assumed in micromagnetic treatment of (Ga,Mn)As [34][35][36]. However, many first principle calculations show that the exchange constants in zinc-blende DMS structure may be anisotropic, which holds when neglecting spin-orbit coupling (SOC) [36][37][38], and is even more robust if SOC is taken into account [20,38,40,41,6]. Although not very large, the exchange anisotropy could affect the alignment of the DWs in our sample.…”

Section: Minimizing the Total Dw Energy Yields (See Details In The Sumentioning

confidence: 99%

“…there are key open questions regarding the general magnetic properties of the DMSs, such as the value of its Curie temperature, exchange stiffness and magnetization, and puzzling magnetic anisotropy (see e.g. [5,7]). In particular, there is no convincing explanation of the unusual in-plane uniaxial anisotropy that emerges from a presumably tetragonal DMS lattice [5,8].…”

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confidence: 99%

Extreme asymmetry of Néel domain walls in multilayered films of the dilute magnetic semiconductor (Ga,Mn)(As,P)

et al. 2018

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We report on unconventional perfectly shaped, fully asymmetric ~ 90 0 Neel domain walls in multilayered films of the diluted ferromagnetic semiconductor (Ga,Mn)(As,P) with stepwise variation of P-doping. Our results contradict micromagnetic calculations, which favor symmetric domain walls due to crystallographic anisotropy and stray field energy. We demonstrate that both the puzzling uniaxial in-plane anisotropy in the tetragonal multilayered film and the asymmetry of the domain walls could result from Dzyaloshinskii-Moriya interactions that are enhanced by the multiple sharp interfaces between the layers and from anisotropic nonrelativistic exchange coupling. Our finding shows that digital variations of composition during the molecular beam epitaxy can be used to tune the anisotropy and chirality of magnetic multilayers. Diluted magnetic semiconductors (DMSs) [1-5] are remarkable quantum materials that offer unique spintronics applications [6] and are full of surprises. In these materials, randomly distributed magnetic ions separated by tens of interatomic distances, interact

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“…Most of these methods have been used to obtain information on anisotropy bulk properties of this material. Recently we have proposed 5 that one can use the SWR to get information on such magnetic properties as surface anisotropy and surface pinning energy of (Ga,Mn)As thin films and their dependence on the orientation of magnetization in the material.…”

mentioning

confidence: 99%

Ferromagnetic resonance in thin films studied via cross-validation of numerical solutions of the Smit-Beljers equation: Application to (Ga,Mn)As

Tomczak¹,

Puszkarski²

2018

Phys. Rev. B

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The new method of numerical analysis of experimental ferromagnetic resonance (FMR) spectra in thin films is developed and applied to (Ga,Mn)As thin films. Specifically, it starts with the finding of numerical solutions of Smit-Beljers (SB) equation and continues with their subsequent statistical analysis within the cross-validation (CV) approach taken from machine learning techniques. As a result of this treatment we are able to reinterpret the available FMR experimental results in diluted ferromagnetic semiconductor (Ga,Mn)As thin films with resulting determination of magnetocrystalline anisotropy constants. The outcome of CV analysis points that it is necessary to take into account terms describing the bulk cubic anisotropy up to the fourth order to reproduce FMR experimental results for (Ga,Mn)As correctly. This finding contradicts the wide-spread conviction in the literature that only first order cubic anisotropy term is important in this material. We also provide numerical values of these higher order cubic anisotropy constants for (Ga,Mn)As thin films resulting from SB-CV approach.

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Spin-wave resonance as a tool for probing surface anisotropies in ferromagnetic thin films: Application to the study of (Ga,Mn)As

Cited by 13 publications

References 61 publications

Ферромагнитный и спин-волновой резонанс в тонкой пленке (30 nm) сверхрешетки [CoFe/Cu]-=SUB=-N-=/SUB=-

Ферромагнитный и спин-волновой резонанс в тонкой пленке (30 nm) сверхрешетки [CoFe/Cu]-=SUB=-N-=/SUB=-

Extreme asymmetry of Néel domain walls in multilayered films of the dilute magnetic semiconductor (Ga,Mn)(As,P)

Ferromagnetic resonance in thin films studied via cross-validation of numerical solutions of the Smit-Beljers equation: Application to (Ga,Mn)As

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