TY - JOUR
T1 - Ultrafast optical tuning of ferromagnetism via the carrier density
AU - Matsubara, Masakazu
AU - Schroer, Alexander
AU - Schmehl, Andreas
AU - Melville, Alexander
AU - Becher, Carsten
AU - Trujillo-Martinez, Mauricio
AU - Schlom, Darrell G.
AU - Mannhart, Jochen
AU - Kroha, Johann
AU - Fiebig, Manfred
N1 - Funding Information:
We thank T. Stollenwerk for fruitful discussions. This work was supported by the Alexander von Humboldt Foundation, by the SNSF (Grant No. 200021_147080/1), the TRR 80 of the DFG and the AFOSR (Grant No. FA9550-10-1-0123).
Publisher Copyright:
© 2015, Nature Publishing Group. All rights reserved.
PY - 2015/4/2
Y1 - 2015/4/2
N2 - 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 Eu1-xGdxO, 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.
AB - 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 Eu1-xGdxO, 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.
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U2 - 10.1038/ncomms7724
DO - 10.1038/ncomms7724
M3 - Article
AN - SCOPUS:84926379225
SN - 2041-1723
VL - 6
JO - Nature Communications
JF - Nature Communications
M1 - 6724
ER -