Laser induced spin precession in highly anisotropic granular L1 FePt | Zendy

J. J. Becker | Zendy; O. Mosendz | Zendy; D. Weller | Zendy; A. Kirilyuk | Zendy; J.C. Maan | Zendy; Peter C. M. Christianen | Zendy; Th. Rasing | Zendy; A. V. Kimel | Zendy

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Laser induced spin precession in highly anisotropic granular L1 FePt

Author(s) -

J. J. Becker,

O. Mosendz,

D. Weller,

A. Kirilyuk,

J.C. Maan,

Peter C. M. Christianen,

Th. Rasing,

A. V. Kimel

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4871869

Subject(s) - precession , condensed matter physics , magnetocrystalline anisotropy , anisotropy , kerr effect , larmor precession , spin (aerodynamics) , magnetic anisotropy , magnetic field , laser , materials science , field (mathematics) , magneto optic kerr effect , physics , magnetization , optics , quantum mechanics , mathematics , nonlinear system , pure mathematics , thermodynamics

The dynamic magnetic properties of a highly anisotropic, granular L10 FePt thin film in magnetic fields up to 7 T are investigated using time-resolved magneto-optical Kerr effect measurements. We find that ultrashort laser pulses induce coherent spin precession in the granular FePt sample. Frequencies of spin precession up to over 400 GHz are observed, which are strongly field and temperature dependent. The high frequencies can be ascribed to the high value of the magnetocrystalline anisotropy constant Ku leading to large anisotropy fields Ha of up to 10.7 T at 170 K. A Gilbert damping parameter of α ∼ 0.1 was derived from the lifetimes of the oscillations.

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