Observation of Precessional Magnetization Dynamics in L10-FePt Thin Films with Different L10 Order Parameter Values

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Published 18 June 2013 • Copyright (c) 2013 The Japan Society of Applied Physics
, , Citation Satoshi Iihama et al 2013 Jpn. J. Appl. Phys. 52 073002 DOI 10.7567/JJAP.52.073002

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1 Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

2 WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Dates

  1. Received 16 February 2013
  2. Accepted 1 May 2013
  3. Published

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Abstract

Fast magnetization precession was observed in L10-FePt thin films with different L10 order parameter values by all optical pump–probe technique. Precession frequency was varied widely for the films with different order parameter, which is due to large difference in perpendicular magnetic anisotropy. Gilbert damping constant (α) was estimated from relaxation time as apparent damping. Clear difference in α was not observed with different perpendicular magnetic anisotropy.

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10.7567/JJAP.52.073002