Magnetic vortices in single crystalline Fe-V disks with four folds magnetic anisotropy

Mitsuzuka, K.; Lacour, Daniel; Hehn, M.; Andrieu, S.; Montaigne, F.

doi:10.1063/1.4711219

Cited by 12 publications

(13 citation statements)

References 15 publications

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“…We start first with a description of the experimental setup [13] (FIG.1). The right inset shows an image of the sample: a circular nanodot, which is patterned by standard lithography and ion-milling techniques from an extended film of Fe-V (10% V) [14] with magnetization 4πM s = 17 kG. A magnetic tip is brought in the vicinity of the sample (left image).…”

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Probing the Anharmonicity of the Potential Well for a Magnetic Vortex Core in a Nanodot

et al. 2013

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Probing the Anharmonicity of the Potential Well for a Magnetic Vortex Core in a Nanodot

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“…In such a situation, the calculations of the demagnetizing field greatly simplify, as is exemplified by Eqs. (26) and (27) of Ref. [32].…”

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“…For the DI contribution, both derivatives ∂ 2 θi E DI and ∂ 2 ϕi E DI survive in Eq. (27) when evaluated at the equilibrium state (θ i = π/2, ϕ i = 0), whereas the cross derivatives vanish. Consequently, we obtain…”

Section: Di-induced Frequency Shiftmentioning

confidence: 99%

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Ferromagnetic resonance of a two-dimensional array of nanomagnets: Effects of surface anisotropy and dipolar interactions

et al. 2018

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We develop an analytical approach for studying the FMR frequency shift due to dipolar interactions and surface effects in two-dimensional arrays of nanomagnets with (effective) uniaxial anisotropy along the magnetic field. For this we build a general formalism on the basis of perturbation theory that applies to dilute assemblies but which goes beyond the point-dipole approximation as it takes account of the size and shape of the nano-elements, in addition to their separation and spatial arrangement. The contribution to the frequency shift due to the shape and size of the nanoelements has been obtained in terms of their aspect ratio, their separation and the lattice geometry. We have also varied the size of the array itself and compared the results with a semi-analytical model and reached an agreement that improves as the size of the array increases. We find that the red-shift of the ferromagnetic resonance due to dipolar interactions decreases for smaller arrays. Surface effects may induce either a blue-shift or a red-shift of the FMR frequency, depending on the crystal and magnetic properties of the nano-elements themselves. In particular, some configurations of the nano-elements assemblies may lead to a full compensation between surface effects and dipole interactions.

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“…1). At this thickness, the demagnetizing energy (scaling as the square of the thickness) is reduced enough to avoid the existence of a non-uniform ground state [22][23][24]. This geometry ensures a quasi-uniform ground state without any internal degrees of freedom and two equivalent directions with four possible stable states [25] along the square diagonals.…”

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A tunable magnetic metamaterial based on the dipolar four-state Potts model

et al. 2018

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Metamaterials, tunable artificial materials, are useful playgrounds to investigate magnetic systems. So far, artificial Ising spin systems have revealed unusual features like emergent magnetic monopoles[1,2] and charge fragmentation[3]. Here, we present a metasystem composed of a lattice of dipolarly-coupled nanomagnets. The magnetic spin of each nanomagnet is constrained to lie along a body diagonal, yielding four possible spin states. We show that the magnetic ordering of this metasystem (antiferromagnetic, ferromagnetic or spin-ice like) is determined by the spin states orientation relative to the underlying lattice. The dipolar four-state Potts model explains our experimental observations and sheds light on the role of symmetry, as well as short-and longrange dipolar magnetic interactions, in such non-Ising spin systems. Dipolar interactions in magnetic systems have been heavily studied because of their exotic physics and strongly affect essential technologies such as permanent magnets or hard disk drives [4-6]. In addition, statistical physics covers a host of applications ranging from fundamental physics to business analysis. In both cases, Ising model holds a central role. This two-spin state model has been widely used to grasp the essence of a variety of effects belonging to the field of condensed matter physics, such as phase transitions, spin glasses, magnetism, spin chains and geometric frustration. In 2006, Zhang and collaborators conducted the first experiments on artificial Ising spin systems at a

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Magnetic vortices in single crystalline Fe-V disks with four folds magnetic anisotropy

Cited by 12 publications

References 15 publications

Probing the Anharmonicity of the Potential Well for a Magnetic Vortex Core in a Nanodot

Probing the Anharmonicity of the Potential Well for a Magnetic Vortex Core in a Nanodot

Ferromagnetic resonance of a two-dimensional array of nanomagnets: Effects of surface anisotropy and dipolar interactions

A tunable magnetic metamaterial based on the dipolar four-state Potts model

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