Masakazu Matsubara, Andreas Schmehl, Jochen Mannhart, Alexander Melville, Darrell G. Schlom, Mauricio Trujillo Martinez, Alexander Schroer, Johann Kroha, Manfred Fiebig
Ultrafast strengthening or quenching of the ferromagnetic order of semiconducting Eu1-xGdxO was achieved by resonant photoexcitation. The modification of the magnetic order is established within 3 ps and detected via optical second harmonic generation. A theoretical analysis shows that the response is determined by the interplay of chemically and optically generated carriers in a nonequilibrium scenario beyond the three-temperature model. General criteria for the design of spintronics materials with tunable ultrafast spin dynamics are given.
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http://arxiv.org/abs/1304.2509
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