Microwave spectroscopy on magnetization reversal dynamics of nanomagnets with electronic detection

Grollier, Julie; Costache, Marius V.; Wal, van der Caspar; Wees, van Bart

doi:10.1063/1.2218464

Cited by 28 publications

(20 citation statements)

References 19 publications

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“…This feature was previously reported by Grollier et al [16], when the longitudinal magnetization reverses. In the longitudinal field geometry, the magnetization reversal does not take place by depinning of the pinned DW but rather by the nucleation of a reversed domain and subsequent DW propagation.…”

Section: Resultssupporting

confidence: 70%

Electrical detection of internal dynamical properties of domain walls

Sangiao

Viret

2014

Phys. Rev. B

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We report here on the electrical detection of the ferromagnetic resonance in a notched Py stripe using the spin rectification effect. A lock-in detection technique is used to measure the rectified voltage generated when applying a radio-frequency field. The multiple peaks associated with the presence of a domain wall, observed during field scans, are properly identified with the help of dynamical micromagnetic simulations. It is found that at any frequency below 6 GHz some specific areas of the inhomogeneous magnetization within the domain wall can find a resonant condition and generate a voltage by rectification of the induction currents in the circuit.

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Section: Resultssupporting

confidence: 70%

Electrical detection of internal dynamical properties of domain walls

Sangiao

Viret

2014

Phys. Rev. B

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“…Above a threshold power of ÿ7 dBm, the depinning field starts to be strongly reduced for the resonant case, whereas the nonresonant current only weakly influences the depinning field due to heating. This pronounced nonlinear behavior points to a strongly nonharmonic potential as previously observed for field-induced resonance [31]. Such domain wall oscillators have recently been proposed theoretically [32], and the observed nonlinearity bodes well for a future possible device that would rely on phase locking a large number of wall oscillators.…”

Section: -3mentioning

confidence: 57%

Detection of Current-Induced Resonance of Geometrically Confined Domain Walls

et al. 2007

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Magnetic domain walls are found to exhibit quasiparticle behavior when subjected to geometrical variations. Because of the spin torque effect such a quasiparticle in a potential well is excited by an ac current leading to a dip in the depinning field at resonance for current densities as low as 2 10 10 A=m 2 . Independently the resonance frequencies of transverse walls and vortex walls are determined from the dc voltage that develops due to a rectifying effect of the resonant domain wall oscillation. The dependence on the injected current density reveals a strongly nonharmonic oscillation.

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“…Several other experiments confirmed the MAMR effect. Specifically, Grollier et al 5 demonstrated microwave-assisted reversal in cobalt strips by means of anisotropic magnetoresistance measurements; Nembach et al 6 and Pimentel et al 7 10,11 reported the observation of MAMR effects in Permalloy layers in magnetic tunnel junctions.…”

mentioning

confidence: 97%

Observation of microwave-assisted magnetization reversal in Fe65Co35 thin films through ferromagnetic resonance measurements

Nistor¹,

Sun²,

Wang³

et al. 2009

Applied Physics Letters

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This letter reports a new approach for microwave-assisted magnetization reversal (MAMR) measurements and the demonstration of MAMR in a Fe65Co35 thin film with this approach. The approach uses a microstrip line to deliver microwaves to and measure the ferromagnetic resonance (FMR) of the sample. The switching field is determined through the measurements of the FMR absorption as a function of static field. In the presence of microwaves, a reduction in switching field by 50% was observed in a Fe65Co35 film. This reduction was independent of the duration of microwave pulses. This indicates the reduction is not a heating effect.

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Microwave spectroscopy on magnetization reversal dynamics of nanomagnets with electronic detection

Cited by 28 publications

References 19 publications

Electrical detection of internal dynamical properties of domain walls

Electrical detection of internal dynamical properties of domain walls

Detection of Current-Induced Resonance of Geometrically Confined Domain Walls

Observation of microwave-assisted magnetization reversal in Fe65Co35 thin films through ferromagnetic resonance measurements

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