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Perpendicular magnetization of FePt particles in silica induced by swift heavy ion irradiation

J.C. Pivin 1 F. Singh O. Angelov L. Vincent 2
1 CSNSM PCI
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Abstract : Particles of the FePt intermetallic compound with L1(0) structure embedded in silica films were submitted to irradiation by 120 MeV Au ions at different fluences. Observations by transmission electron microscopy evidenced an elongation of the particles, ascribed to an anisotropic ripening process during the thermal spikes occurring in the wake of the ions. However, the observed changes in the magnetic properties are attributed to the magnetostriction of the particles. Their compression by the matrix induces a tilt of easy magnetization axis from in-plane to perpendicular to the film surface, together with an increase in coercivity.
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Submitted on : Thursday, April 5, 2012 - 4:43:02 PM
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J.C. Pivin, F. Singh, O. Angelov, L. Vincent. Perpendicular magnetization of FePt particles in silica induced by swift heavy ion irradiation. Journal of Physics D: Applied Physics, IOP Publishing, 2009, 42, pp.025005. ⟨10.1088/0022-3727/42/2/025005⟩. ⟨in2p3-00685710⟩

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