[en] Using large-scale computer simulations, we thoroughly study the minimum energy required to ther- mally induced magnetization switching (TIMS) after the application of a femtosecond heat pulse in transition metal-rare earth ferrimagnetic alloys. We find that for an energy efficient TIMS, a low ferrimagnetic net magnetization with a strong temperature dependence is the relevant factor for the magnetic system. For the lattice and electron systems, the key physics for efficient TIMS is a large electron-phonon relaxation time. Importantly, we show that as the cooling time of the heated elec- trons is increased, the minimum power required to produce TIMS can be reduced by an order of magnitude. Our results show the way to low power TIMS by appropriate engineering of magnetic heterostructures.
Disciplines :
Physics
Author, co-author :
Atxitia, U.
Ostler, Thomas ; Université de Liège > Département de physique > Physique des matériaux et nanostructures
Chantrell, R. W.
Chubykalo-Fesenko, O.
Language :
English
Title :
Optimal electron, phonon, and magnetic characteristics for low energy thermally induced magnetization switching
Publication date :
09 November 2015
Journal title :
Applied Physics Letters
ISSN :
0003-6951
eISSN :
1077-3118
Publisher :
American Institute of Physics, United States - New York
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