Metamagnetic domains in antiferromagnetically coupled multilayers with perpendicular anisotropy

Kiselev, Nikolai S.; Bran, Cristina; Wolff, Ulrike; Schultz, L.; Bogdanov, A. N.; Hellwig, Olav; Neu, V.; Rößler, U.

doi:10.1103/physrevb.81.054409

Cited by 22 publications

(14 citation statements)

References 31 publications

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“…Originally, they have been described as chiral vortex-like configurations, but they are smooth and stable, topologically non-trivial magnetization configurations and, therefore, can be identified as skyrmions in the micromagnetic limit with constant magnetization modulus, |M| = const . These skyrmions differ from other axisymmetric patterns induced by external dipole-dipole forces (bubble domains in nanolayers [4] and magnetic vortices in magnetic nanodots [5]). Importantly, chiral skyrmions can also arise in nanolayers of magnetic metals where they are stabilized by surface/interface induced DM interactions [6].…”

mentioning

confidence: 64%

Chiral skyrmions in thin magnetic films: new objects for magnetic storage technologies?

Kiselev¹,

Bogdanov²,

Schäfer³

et al. 2011

J. Phys. D: Appl. Phys.

403

387

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Axisymmetric magnetic lines of nanometer sizes (chiral vortices or skyrmions) have been predicted to exist in a large group of noncentrosymmetric crystals more than two decades ago. Recently these magnetic textures have been directly observed in nanolayers of cubic helimagnets and monolayers of magnetic metals. We develop a micromagnetic theory of chiral skyrmions in thin magnetic layers for magnetic materials with intrinsic and induced chirality. Such particle-like and stable micromagnetic objects can exist in broad ranges of applied magnetic fields including zero field. Chiral skyrmions can be used as a new type of highly mobile nanoscale data carriers.

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mentioning

confidence: 64%

Chiral skyrmions in thin magnetic films: new objects for magnetic storage technologies?

Kiselev¹,

Bogdanov²,

Schäfer³

et al. 2011

J. Phys. D: Appl. Phys.

403

387

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“…If a finite demagnetization field is present, the high‐field FM phase is reached through a “mixed phase,” existing in a finite range of fields. In this phase, AFM and FM orders coexist . There are numerous possible arrangements of FM and AFM domains, and consequently a very rich excitation spectrum can be anticipated.…”

Section: Introductionmentioning

confidence: 99%

Controllable Broadband Absorption in the Mixed Phase of Metamagnets

Pregelj

Zaharko

Zorko

et al. 2015

Adv Funct Materials

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wileyonlinelibrary.comunconventional fractional excitations, [1][2][3][4][5][6] nontrivial scale-invariant quantum excitations at quantum critical points, [7][8][9][10][11][12] and nonresonant absorption in superconductors. [ 13 ] In the context of applications, broadband microwave absorption is highly desirable in microwave fi lters, [ 14 ] signalto-noise enhancers, optical signal processing, [15][16][17] electromagnetic interference shielding, [ 18,19 ] etc. Most of these applications are based on conducting materials, even though normal metals possess relatively narrow absorption ranges (typically 100-1000 MHz). [ 18 ] Hence, composite carbon-based materials, [19][20][21] which extend the absorption range from hundreds of kHz up to hundreds of GHz, [ 18 ] and multilayer magnetic structures that cover the range between several GHz and several THz [22][23][24][25][26] are being developed. However, none of these materials allow for external control of their absorption properties, e.g., by the electric or the magnetic fi eld.A class of materials that could allow for a controllable (ondemand) broadband absorption are metamagnets. These systems are, typically, highly anisotropic and, as a function of the external magnetic fi eld, undergo a fi rst-order phase transition from a state with low magnetization to a state with high magnetization. [ 27 ] Prominent examples are layered metamagnets with perpendicular anisotropy, where ferromagnetic (FM) layers are antiferromagnetically (AFM) aligned. Such systems are not affected by magnetic fi elds perpendicular to the layers until the applied fi eld becomes comparable to the AFM interlayer interaction, when a fi rst-order transition to an FM structure occurs. If a fi nite demagnetization fi eld is present, the high-fi eld FM phase is reached through a "mixed phase," existing in a fi nite range of fi elds. In this phase, AFM and FM orders coexist. [27][28][29][30] There are numerous possible arrangements of FM and AFM domains, [ 29,30 ] and consequently a very rich excitation spectrum can be anticipated. Up to now, studies of the mixed phase have almost exclusively been restricted to ac susceptibility measurements and thus to a frequency range of 0.1-100 kHz. [31][32][33][34][35] Therefore, the intriguing dynamics of the mixed phase have remained elusive.In this paper, we focus on the recently discovered layered metamagnet Cu 3 Bi(SeO 3 ) 2 O 2 Br, with kagome-like Cu layers stacked along the c -axis. [ 36 ] At T N = 27.4 K, the system develops Controllable Broadband Absorption in the Mixed Phase of MetamagnetsMatej Pregelj , * Oksana Zaharko , Andrej Zorko , Matjaž Gomilšek , Oles Sendetskyi , Axel Günther , Mykhaylo Ozerov , Sergei A. Zvyagin , Hubertus Luetkens , Christopher Baines , Vladimir Tsurkan , and Alois Loidl Materials with broad absorption bands are highly desirable for electromagnetic fi ltering and processing applications, especially if the absorption can be externally controlled. Here, a new class of broadband-absorption materials is introduced. Namely, ...

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“…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. Materials with strong perpendicular anisotropy are also of technological importance in the field of magnetic multilayers (see [5] and references therein).…”

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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Metamagnetic domains in antiferromagnetically coupled multilayers with perpendicular anisotropy

Cited by 22 publications

References 31 publications

Chiral skyrmions in thin magnetic films: new objects for magnetic storage technologies?

Chiral skyrmions in thin magnetic films: new objects for magnetic storage technologies?

Controllable Broadband Absorption in the Mixed Phase of Metamagnets

Theory of magnetic domains in uniaxial thin films

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