Controlling the spins angular momentum in ferromagnets with sequences of picosecond acoustic pulses.

Abstract:

:Controlling the angular momentum of spins with very short external perturbations is a key issue in modern magnetism. For example it allows manipulating the magnetization for recording purposes or for inducing high frequency spin torque oscillations. Towards that purpose it is essential to modify and control the angular momentum of the magnetization which precesses around the resultant effective magnetic field. That can be achieved with very short external magnetic field pulses or using intrinsically coupled magnetic structures, resulting in a transfer of spin torque. Here we show that using picosecond acoustic pulses is a versatile and efficient way of controlling the spin angular momentum in ferromagnets. Two or three acoustic pulses, generated by femtosecond laser pulses, allow suppressing or enhancing the magnetic precession at any arbitrary time by precisely controlling the delays and amplitudes of the optical pulses. A formal analogy with a two dimensional pendulum allows us explaining the complex trajectory of the magnetic vector perturbed by the acoustic pulses.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kim JW,Vomir M,Bigot JY

doi

10.1038/srep08511

subject

Has Abstract

pub_date

2015-02-17 00:00:00

pages

8511

issn

2045-2322

pii

srep08511

journal_volume

5

pub_type

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