Ultrafast Optical Tuning of Ferromagnetism via the Carrier Density

Autor:	Mauricio Trujillo-Martinez, Manfred Fiebig, A. Schmehl, Carsten Becher, Johann Kroha, Alexander Melville, Alexander Schroer, Jochen Mannhart, Masakazu Matsubara, Darrell G. Schlom
Rok vydání:	2015
Předmět:	Photoexcitation Multidisciplinary Charge-carrier density Materials science Condensed matter physics Ferromagnetism Information storage Magnetic order General Physics and Astronomy General Chemistry Ultrashort pulse General Biochemistry Genetics and Molecular Biology
Zdroj:	Nature Communications Nature Communications, 6
DOI:	10.1038/ncomms7724
Popis:	Interest in manipulating the magnetic order by ultrashort laser pulses has thrived since it was observed that such pulses can be used to alter the magnetization on a sub-picosecond timescale. Usually this involves demagnetization by laser heating or, in rare cases, a transient increase of magnetization. Here we demonstrate a mechanism that allows the magnetic order of a material to be enhanced or attenuated at will. This is possible in systems simultaneously possessing a low, tunable density of conduction band carriers and a high density of magnetic moments. In such systems, the thermalization time can be set such that adiabatic processes dominate the photoinduced change of the magnetic order--the three-temperature model for interacting thermalized electron, spin and lattice reservoirs is bypassed. In ferromagnetic Eu(1-x)Gd(x)O, we thereby demonstrate the strengthening as well as the weakening of the magnetic order by ~10% and within ≤3 ps by optically controlling the magnetic exchange interaction.
Databáze:	OpenAIRE
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