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Abstract
We perform ultrafast pump-probe measurements on a nanometer-thick crystalline Bi-doped yttrium iron garnet film with perpendicular magnetic anisotropy. Tuning the photon energy of the pump laser pulses above and below the material's band gap, we trigger ultrafast optical and spin dynamics via both one- and two-photon absorption. Contrary to the common scenario, the optically induced excitation induces an increase up to 20% of the ferromagnetic resonance frequency of the material. We explain this unexpected result in terms of a modification of the magnetic anisotropy caused by a long-lived photo-induced strain, which transiently and reversibly modifies the magnetoelastic coupling in the material. Our results disclose the possibility to optically increase the magnetic eigenfrequency in nanometer-thick magnets.
Highlights
Since the discovery of the giant magnetoresistance effect [1], static equilibrium magnetization states are the most common method to encode digital information in data centers worldwide
Magnetization dynamics is attractive for technology since the frequency of magnetization precession can be tuned from the gigahertz to the terahertz range by the choice of different materials or by tuning an externally applied magnetic field [3]
Ultrashort light pulses have emerged as an efficient tool to initiate and probe magnetization dynamics in iron garnets on thepicosecond timescale [17,18,19,20]
Summary
Since the discovery of the giant magnetoresistance effect [1], static equilibrium magnetization states are the most common method to encode digital information in data centers worldwide. We perform ultrafast pump-probe measurements on a nanometer-thick crystalline Bi-doped yttrium iron garnet film with perpendicular magnetic anisotropy. Tuning the photon energy of the pump laser pulses above and below the material’s band gap, we trigger ultrafast optical and spin dynamics via both one- and two-photon absorption.
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