An Introduction to Micromagnetics in the Dynamic Regime

Miltat, J.; Albuquerque, G.; Thiaville, A.

doi:10.1007/3-540-40907-6_1

Cited by 75 publications

(77 citation statements)

References 22 publications

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“…In our experiment we follow theoretical predictions (8,9), suggesting that switching can be achieved by field pulses along the in-plane magnetic hard axis of a memory cell. The pulsed field is thus oriented at ± 90° angle from the initial or final magnetization direction and the switching is expected to be symmetric, i.e.…”

Section: Articlesupporting

confidence: 71%

“…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). In the first experimental demonstration of precessional switching intense magnetic field pulses of only a few ps duration were used to reverse large domains in Co and Co/Pt thin films (6,7).…”

Section: Articlementioning

confidence: 99%

“…In the first experimental demonstration of precessional switching intense magnetic field pulses of only a few ps duration were used to reverse large domains in Co and Co/Pt thin films (6,7). Numerical simulations pointed out that precessional switching should also be applicable for small magnetic cells (8,9) as used in magnetic random access memories (M-RAM) (12) and with technically available pulse durations longer than 100 ps. The first observations of such processes, in the limit of high pulse amplitudes and short pulse duration were recently reported (13).…”

Section: Articlementioning

confidence: 99%

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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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Section: Articlesupporting

confidence: 71%

Section: Articlementioning

confidence: 99%

Section: Articlementioning

confidence: 99%

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Phase Coherent Precessional Magnetization Reversal in Microscopic Spin Valve Elements

et al. 2003

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“…6,7,8,9,10,11,12 Instead of applying a field pulse antiparallel to the initial magnetization, a perpendicular field pulse is applied and induces a large angle precession. If the pulse is terminated at 180 • angle of the precession, whose period is usually of the order of picoseconds, the magnetization is reversed.…”

Section: Introductionmentioning

confidence: 99%

Minimal field requirement in precessional magnetization switching

Tsoi

Niu

2006

Journal of Applied Physics

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We investigate the minimal field strength in precessional magnetization switching using the Landau-Lifshitz-Gilbert equation in under-critically damped systems. It is shown that precessional switching occurs when localized trajectories in phase space become unlocalized upon application of field pulses. By studying the evolution of the phase space, we obtain the analytical expression of the critical switching field in the limit of small damping for a magnetic object with biaxial anisotropy. We also calculate the switching times for the zero damping situation. We show that applying field along the medium axis is good for both small field and fast switching times.

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“…[1][2][3][4][5] In practice, this is done by pulling the magnetization of a thin magnetic element out of plane with a short magnetic field pulse. The thus created strong demagnetizing field will drive the magnetization to the reversed position, at which time the magnetic field pulse should be precisely switched off.…”

mentioning

confidence: 99%

Frequency analysis of the magnetization dynamics in thin ellipsoidal magnetic elements

et al. 2006

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We report a full analysis of the magnetization dynamics in thin ellipsoidal Permalloy ͑Ni 80 Fe 20 ͒ elements, made both experimentally, using an all optical pump-probe scheme based on the magneto-optical Kerr effect, and numerically, using micromagnetic simulations. We have found experimentally as well as numerically that the precession frequencies shift with the aspect ratio of the element, with stronger effects for smaller sizes. Moreover, the magnetization dynamics is found to be inhomogeneous, and can be decomposed into three different kinds of localized precession modes: a low frequency edge mode, a main mode which is composed of several modes with frequencies close to each other, and some higher-order modes.

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An Introduction to Micromagnetics in the Dynamic Regime

Cited by 75 publications

References 22 publications

Phase Coherent Precessional Magnetization Reversal in Microscopic Spin Valve Elements

Phase Coherent Precessional Magnetization Reversal in Microscopic Spin Valve Elements

Minimal field requirement in precessional magnetization switching

Frequency analysis of the magnetization dynamics in thin ellipsoidal magnetic elements

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