On the theory of the domain structure of thin films of magnetically uni-axial materials

Málek, Z.; Kamberský, V.

doi:10.1007/bf01612066

Cited by 174 publications

(76 citation statements)

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“…This refers in particular to films with perpendicular magnetic anisotropy, [1][2][3][4][5][6][7][8][9] whereas the main effect of magnetostatic interactions in films with easy-plane anisotropy is to confine the magnetization to the film plane. 10,11 To illustrate the difference, we approximate the thin film by a homogeneously magnetized ellipsoid of revolution of volume V whose radius R x ϭR y ϭR is much larger than the ''film thickness'' 2R z .…”

Section: ͑1͒mentioning

confidence: 99%

“…[4][5][6] However, the thickness t of those films, typically of order 100 nm, greatly exceeds micromagnetic lengths such as the domain-wall width, which is at most of order 10 nm for the films considered. A fairly recent development is the deposition and investigation of ultrathin transition-metal films with perpendicular anisotropy.…”

Section: ͑1͒mentioning

confidence: 99%

“…The size of magnetic domains in infinite ultrathin films with perpendicular anisotropy has been investigated in a number of works. 4,[17][18][19][20][21] Málek and Kamberský 4 considered domains in MnBi films, where perpendicular anisotropy is associated with the hexagonal NiAs structure of the bulk material. That approach, which has been extrapolated to ultrathin films by Kaplan and Gehring 19 and Millev,20 neglects the domain-wall width ␦ w .…”

Section: Domain Formationmentioning

confidence: 99%

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Micromagnetics of ultrathin films with perpendicular magnetic anisotropy

1998

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Magnetization processes in ultrathin transition-metal films with perpendicular magnetic anisotropy are investigated. By model calculations it is shown that nucleation in ideal films is incoherent and therefore bulklike, whereas the truly ultrathin limit of coherent nucleation is restricted to film patches of small cross-section areas. In ideal monolayers, the nonzero film thickness leads to bulklike nucleation if the lateral dimensions of the film exceed about 1 m. This means that monolayer patches having submicrometer diameters cannot be regarded as ultrathin in a micromagnetic sense. On the other hand, the critical single-domain diameter of ultrathin films is larger by one order of magnitude than expected from bulk-type thin-film calculations.

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Section: ͑1͒mentioning

confidence: 99%

Section: ͑1͒mentioning

confidence: 99%

Section: Domain Formationmentioning

confidence: 99%

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Micromagnetics of ultrathin films with perpendicular magnetic anisotropy

1998

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“…The ratio 2K/(µ 0 M 2 0 ) (in SI units) is also known as the quality factor Q and the magnetization direction remains perpendicular to the surface for all values of film thickness for Q > 1. Numerous theoretical and experimental works have been devoted to such materials with strong perpendicular magnetic anisotropy [2,3,4]. It has been shown that in such materials the domain width has a minimum as a function of film thickness, increasing towards smaller or larger thicknesses.…”

Section: Introductionmentioning

confidence: 99%

Theory of magnetic domains in uniaxial thin films

Virot¹,

Favre²,

Hayn³

et al. 2012

J. Phys. D: Appl. Phys.

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Abstract.For uniaxial easy axis films, properties of magnetic domains are usually described within the Kittel model, which assumes that domain walls are much thinner than the domains. In this work we present a simple model that includes a proper description of the magnetostatic energy of domains and domain walls and also takes into account the interaction between both surfaces of the film. Our model describes the behavior of domain and wall widths as a function of film thickness, and is especially well suited for the strong stripe phase. We prove the existence of a critical value of magneto-crystalline anisotropy above which stripe domains exist for any film thickness and justify our model by comparison with exact results. The model is in good agreement with experimental data for hcp cobalt.

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“…Domain structures of ferromagnetic thin films are determined by a combination of the thickness of the film as well as magnetic parameters such as spontaneous magnetization, magnetic anisotropy, and exchange stiffness constant. [21][22][23][24][25][26][27] Therefore, the observation of the domain structures under electric fields is expected to provide the information of the electric-field modulations of these parameters, including the exchange stiffness.…”

mentioning

confidence: 99%

Effect of electric-field modulation of magnetic parameters on domain structure in MgO/CoFeB

et al. 2016

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We observe magnetic domain structures of MgO/CoFeB with a perpendicular magnetic easy axis under an electric field. The domain structure shows a maze pattern with electric-field dependent isotropic period. The analysis of the period indicates a major role of the electric-field modulation of interfacial magnetic anisotropy for the observation and possible contribution from electric-field modulation of the exchange stiffness constant.

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On the theory of the domain structure of thin films of magnetically uni-axial materials

Cited by 174 publications

References 0 publications

Micromagnetics of ultrathin films with perpendicular magnetic anisotropy

Micromagnetics of ultrathin films with perpendicular magnetic anisotropy

Theory of magnetic domains in uniaxial thin films

Effect of electric-field modulation of magnetic parameters on domain structure in MgO/CoFeB

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