Switching behavior of vortex structures in nanodisks

Pulwey, Ralph; Rahm, M.; Biberger, J.; Weiss, Dieter

doi:10.1109/20.951058

Cited by 49 publications

(22 citation statements)

References 6 publications

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“…Our model of the IMV can be applied for the description of dynamical effects of the switching of the vortex polarisation [18,19,20]. We expect that the dynamical switching effects should be more pronounced in the ring geometry, because the vortex amplitude µ can smoothly vary and even change its sign.…”

Section: Discussionmentioning

confidence: 99%

Equilibrium magnetisation structures in ferromagnetic nanorings

Kravchuk

Sheka

Gaididei

2007

Journal of Magnetism and Magnetic Materials

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The ground state of the ring-shape magnetic nanoparticle is studied. Depending on the geometrical and magnetic parameters of the nanoring, there exist different magnetisation configurations (magnetic phases): two phases with homogeneous magnetisation (easy-axis and easy-plane phases) and two inhomogeneous (planar vortex phase and out-of-plane one). The existence of a new intermediate out-ofplane vortex phase, where the inner magnetisation is not strongly parallel to the easy axis, is predicted. Possible transitions between different phases are analysed using the combination of analytical calculations and micromagnetic simulations.

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Section: Discussionmentioning

confidence: 99%

Equilibrium magnetisation structures in ferromagnetic nanorings

Kravchuk

Sheka

Gaididei

2007

Journal of Magnetism and Magnetic Materials

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“…Therefore, studies taking into account the application of external potentials such as static and sinusoidal magnetic fields are nowadays very common in the literature. [4][5][6][7][8][9] For instance, the simplest effect induced by an external field is the gyrotropic mode, which is the lowest excitation of the vortex structure. This mode is simply the elliptical vortex core motion ͑with the resonance frequency͒ around the disk center.…”

Section: Introductionmentioning

confidence: 99%

“…External potentials such as magnetic fields or ͑dc͒ spin polarized currents can also stimulate dramatic effects such as the switching behavior. [4][5][6][7] However, no internal mechanisms that were able to induce the core switching were reported neither experimentally nor theoretically. Such a chance would only occur if the vortex could interact with possible inhomogeneities present in the nanostructure.…”

Section: Introductionmentioning

confidence: 99%

Predicted defect-induced vortex core switching in thin magnetic nanodisks

et al. 2008

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We investigate the influence of artificial defects ͑small holes͒ inserted into magnetic nanodisks on the vortex core dynamics. One and two holes ͑antidots͒ are considered. In general, the core falls into the hole; but, in particular, we would like to note an interesting phenomenon not yet observed, which is the vortex core switching induced by the vortex hole interactions. It occurs for the case with only one hole and for very special conditions involving the hole size and position as well as the disk size. Any small deformation in the disk geometry such as the presence of a second antidot completely changes the vortex dynamics, and the vortex core eventually falls into one of the defects. After trapped, the vortex center still oscillates with a very high frequency and small amplitude around the defect center.

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“…It was reported that after the application of strong external perpendicular fields, the Bloch line ͑vortex core͒ can be switched. 23,24 Several studies with small external perpendicular fields were done to investigate the dynamic response of the magnetization to perpendicular field pulses. Buess and co-workers [25][26][27] used temporally resolved magneto-optic Kerr microscopy to observe the modal structure of Py disks after the excitation by a short perpendicular field pulse.…”

Section: Introductionmentioning

confidence: 99%

Influence of perpendicular magnetic fields on the domain structure of permalloy microstructures grown on thin membranes

et al. 2008

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Unlike the broadly studied influence of the in-plane magnetic fields on magnetic domain structures in thin-film elements, not much is known to date, on the changes of the domain structure driven by external magnetic fields applied perpendicular to the plane. Using high-resolution transmission electron microscopy studies combined with micromagnetic modeling, we investigated the effect of static, strong perpendicular fields on square and disk-shaped mesoscopic permalloy elements with a vortex flux-closure magnetization structure. In the case of square elements, we discovered an unexpected, pronounced, and reversible bending of the 90°d omain walls, which increases with the field strength and changes direction when the field direction is reversed. By means of micromagnetic simulations and atomic force microscopy studies, we demonstrate that this effect is connected with the minute curvatures of the sample surface. The slight curvature arises from surface tensions in the membrane on which the microstructures are fabricated.

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Switching behavior of vortex structures in nanodisks

Cited by 49 publications

References 6 publications

Equilibrium magnetisation structures in ferromagnetic nanorings

Equilibrium magnetisation structures in ferromagnetic nanorings

Predicted defect-induced vortex core switching in thin magnetic nanodisks

Influence of perpendicular magnetic fields on the domain structure of permalloy microstructures grown on thin membranes

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