Direct Observation of Magnetic Relaxation in a Small Permalloy Disk by Time-Resolved Scanning Kerr Microscopy

Hiebert, Wayne K.; Stankiewicz, A.; Freeman, M. R.

doi:10.1103/physrevlett.79.1134

Cited by 349 publications

(234 citation statements)

References 11 publications

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“…These simulations are obtained for NiFe(13.6 nm)/Ru(0.47 nm)/NiFe(27.2 nm) from the linearization of the Landau-Lifshitz-Gilbert equation including the damping term (α = 0.008 [15]). In order to reduce the simulation complexity, the biquadratic coupling constant was neglected and we considered J 1 = −350 μJ m −2 as a compromise between matching the saturation field and the optic mode frequency at zero field for this trilayer.…”

Section: Resultsmentioning

confidence: 99%

Microwave spectroscopy with vector network analyzer for interlayer exchange-coupled symmetrical and asymmetrical NiFe/Ru/NiFe

Belmeguenai¹,

Martin²,

Woltersdorf³

et al. 2008

J. Phys.: Condens. Matter

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Vector network analyzer ferromagnetic resonance spectroscopy (VNA-FMR) is used here to study the different excited modes of sputtered asymmetrical NiFe(13.6 nm)/Ru(d Ru )/ NiFe(27.2 nm) exchange-coupled films with variable Ru thicknesses. The obtained results have been compared to those of the symmetrical NiFe(30 nm)/Ru(d Ru )/NiFe(30 nm). In both cases, the measurements show the existence of an optic and an acoustic precessional mode. The optic mode was only observed over limited field ranges, especially in the symmetrical trilayers. To overcome such a limitation, we developed a new technique similar to the longitudinal FMR, where the bias and the rf field are parallel to each other and perpendicular to the pinning field. Interestingly, and in contrast to the symmetrical trilayers, we observed a mode anti-crossing in the dispersion relation of the asymmetrical layers that we attributed to the thickness difference between the two NiFe layers. Our experimental results on the effect of the biquadratic coupling on the mode frequency variations are in good agreement with the theory.

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Section: Resultsmentioning

confidence: 99%

Microwave spectroscopy with vector network analyzer for interlayer exchange-coupled symmetrical and asymmetrical NiFe/Ru/NiFe

Belmeguenai¹,

Martin²,

Woltersdorf³

et al. 2008

J. Phys.: Condens. Matter

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“…The use of the pronounced precession initiated by fast rising magnetic field pulses (2,3,4,5) is currently discussed as a new route towards ultra fast magnetization reversal in future magnetic storage applications. Such precessional reversal promises high energy efficiency together with ultra fast reversal times reaching the fundamental limit of a half precession period (6,7,8,9,10,11).…”

Section: Articlementioning

confidence: 99%

Phase Coherent Precessional Magnetization Reversal in Microscopic Spin Valve Elements

et al. 2003

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We study the precessional switching of the magnetization in microscopic spin valve cells induced by ultra short in-plane hard axis magnetic field pulses. Stable and highly efficient switching is monitored following pulses as short as 140 ps with energies down to 15 pJ.Multiple application of identical pulses reversibly toggles the cell's magnetization between the two easy directions. Variations of pulse duration and amplitude reveal alternating regimes of switching and non-switching corresponding to transitions from inphase to out-of-phase excitations of the magnetic precession by the field pulse. In the low field limit damping becomes predominant and a relaxational reversal is found allowing switching by hard axis fields below the in-plane anisotropy field threshold.

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“…This problem was first studied by Stoner and Wohlfarth 4 ͑SW͒ who showed that a field h larger than the SW-limit h SW can switch the magnetization from its initial state to the target value through a ringing effect. [5][6][7][8][9] However, recent theoretical and experimental studies [8][9][10][11][12] have shown that the minimal switching field can be smaller than the SW limit. Most studies have assumed the magnetic field to be time independent.…”

Section: Introductionmentioning

confidence: 99%

Strategy to reduce minimal magnetization switching field for Stoner particles

Zhen

Wang

2006

Phys. Rev. B

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A strategy is proposed aimed at substantially reducing the minimal magnetization switching field for a Stoner particle. Unlike the normal method of applying a static magnetic field which must be larger than the magnetic anisotropy, a much weaker field, proportional to the damping constant in the weak damping regime, can be used to switch the magnetization from one state to another if the field is along the motion of the magnetization. The concept is to constantly supply energy to the particle from the time-dependent magnetic field to allow the particle to climb over the potential barrier between the initial and the target states.

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Direct Observation of Magnetic Relaxation in a Small Permalloy Disk by Time-Resolved Scanning Kerr Microscopy

Cited by 349 publications

References 11 publications

Microwave spectroscopy with vector network analyzer for interlayer exchange-coupled symmetrical and asymmetrical NiFe/Ru/NiFe

Microwave spectroscopy with vector network analyzer for interlayer exchange-coupled symmetrical and asymmetrical NiFe/Ru/NiFe

Phase Coherent Precessional Magnetization Reversal in Microscopic Spin Valve Elements

Strategy to reduce minimal magnetization switching field for Stoner particles

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