The role of magnetization compensation point for efficient ultrafast control of magnetization in Gd 24 Fe 66.5 Co 9.5 alloy

Rajasekhar Medapalli (), Ilya Razdolski, Matteo Savoini, Ali Reza Khorsand, Alexandra Kalashnikova, Arata Tsukamoto, Akiyoshi Itoh, Andrei Kirilyuk, Alexey Kimel and Theo Rasing

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 4, 1-4

Abstract: The ability of a femtosecond laser pulse to manipulate and reverse the magnetization in a ferrimagnetic Gd 24 Fe 66.5 Co 9.5 thin film was studied experimentally as a function of temperature. For a fixed energy of the laser pulse, the dynamics of magnetization showed different behavior depending on whether the sample temperature was below or above the magnetization compensation point (T M ). The conditions for full ultrafast demagnetization and magnetization reversal were easily achieved below T M , while the same laser excitation caused just 50% demagnetization above T M . This interesting change in magnetization dynamics is qualitatively explained in terms of effective changes in the magnitudes of magnetizations of atomic sublattices. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Date: 2013
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DOI: 10.1140/epjb/e2013-30682-6

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