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Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Magnetization / Demagnetization Dynamics II

MA 35.13: Vortrag

Mittwoch, 18. März 2015, 18:15–18:30, EB 301

The fate of the transient ferromagnetic-like state in ferrimagnetic GdFe alloys — •Ilie Radu1, Loic LeGuyader1, Ilya Radzolsky2, Raja Medapalli2,3, Christian Stamm1,4, Torsten Kachel1, Rolf Mitzner1, Karsten Holldack1, Arata Tsukamoto5, Alexey Kimel2, and Theo Rasing21Helmholtz-Zentrum Berlin, BESSY II, Germany — 2Radboud University Nijmegen, Netherlands — 3University of California, San Diego, USA — 4ETH Zürich, Switzerland — 5Nihon University, Chiba, Japan

Recent femtosecond time-resolved XMCD investigations of ferrimagnetic GdFeCo alloys revealed the existence of a transient ferromagnetic state [1] mediating the ultrafast magnetization switching of antiferromagnetically coupled Fe and Gd spins [2]. Here we present a two-fold strategy on the control of the transient state's lifetime and onset by either changing the alloy stoichiometry or upon varying the laser excitation density. Possible implications for the magnetic switching phenomena in ferrimagnetic alloys and heterostructures will be discussed.

We acknowledge funding from European Union through FEMTOSPIN program and from BMBF through FEMTOSPEX grant No. 05K10PG2.

[1] I. Radu et al., Nature 472, 205 (2011) [2] T. Ostler et al., Nature Commun. 3, 666 (2012)

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