Vortex dynamics in nonparabolic potentials

Langner, Hauke H.; Kamionka, Thomas; Martens, M.; Weigand, Markus; Adolff, Christian F.; Merkt, U.; Meier, Guido

doi:10.1103/physrevb.85.174436

Cited by 12 publications

(18 citation statements)

References 23 publications

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“…5,13,26 In permalloy squares the resonance shift depends on the direction of the external field. In squares a redshift is expected for fields applied along an edge of the square, a blueshift if the field is applied along a diagonal.…”

Section: Resultsmentioning

confidence: 99%

“…In squares a redshift is expected for fields applied along an edge of the square, a blueshift if the field is applied along a diagonal. 13 With the precondition that the vortex trajectory should be in the area encircled by the loop for one half of the period the external field has to be applied in the y direction. Then the vortex is only deflected along the x axis that is defined in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…X-rays enable spatial resolutions in the regime of nanometers. Via the x-ray magnetic circular dichroism even magnetic vortices can be resolved with time-resolved scanning x-ray microscopy [11][12][13] or time-resolved photoemission electron microscopy. [14][15][16][17] The drawback of these two methods is the availability of beam time and the limited precision in frequency.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to other work that investigated ferromagnetic wires 19,20 we aim at electrical detection of the dynamics of a single magnetic vortex. 21 The gyrotropic mode of the vortex core is identified by a characteristic resonance shift in static external fields 13 where the shape of the resonance curve can be described analytically.…”

Section: Introductionmentioning

confidence: 99%

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Inductive detection of magnetic vortex gyration

et al. 2013

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Vortex cores in Landau-domain patterns are resonantly excitable by alternating magnetic fields in the subgigahertz regime. We present a highly sensitive method to detect the vortex gyration in single micrometer-sized elements spectroscopically by measuring spectra of induction voltages caused by the stray fields of a single ferromagnetic square exposed to an alternating Oersted field. A distinct change of the induction voltage is observed around the resonance frequency of the vortex core. The shape of the measured spectra deviates from Lorentzian profiles due to voltages induced by magnetic fringing fields of the exciting currents. An analytical description of the measured spectra is given. A characteristic frequency shift in external magnetic fields proves that signals detected by the induction sensor originate from the dynamically excited Landau-domain pattern. The measurements on a single square are compared with measurements on an ensemble of uniform squares.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inductive detection of magnetic vortex gyration

et al. 2013

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“…A very challenging variation is near-field Brillouin scattering, which has been used to image edge mode dynamics with resolution below 55 nm [17]. X-ray microscopy based on magnetic circular dichroism also provides dynamic magnetic imaging [18][19][20] with resolution as fine as 25 nm. [18] In parallel, ferromagnetic resonance force microscopy (FMRFM) [21][22][23][24] has been developed and proven to be a useful tool for various areas in magnetic dynamics, such as spin wave dynamics in confined structures [22,[25][26][27][28][29][30], spin-transfer torque device dynamics [31], defect detection in an array [32], and spin wave localization [33][34][35][36].…”

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confidence: 99%