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MA: Fachverband Magnetismus

MA 35: Magnetization / Demagnetization Dynamics II

MA 35.13: Talk

Wednesday, March 18, 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 Medapalli^2,3, Christian Stamm^1,4, Torsten Kachel¹, Rolf Mitzner¹, Karsten Holldack¹, Arata Tsukamoto⁵, Alexey Kimel², and Theo Rasing² — ¹Helmholtz-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)