Abstract
The recently derived Landau-Lifshitz-Bloch equation of motion for two-component magnetic systems, including ferri- ferro- and antiferromagnets, provides a framework to analyze species dependent ultra fast demagnetization rates. In agreement with reported experimental observations, we show that Gd sublattice demagnetizes slower then FeCo in GdFeCo. However, we predict that at high initial temperatures Gd should be faster than Fe, providing the possibility to control the polarity of the transient antiferromagnetic state. Our results indicate that typically Fe should be slower than Ni in FeNi. The situation is opposite if Fe is 4 times stronger coupled to the electronic system than Ni.
Access provided by Autonomous University of Puebla. Download to read the full chapter text
Chapter PDF
Similar content being viewed by others
Keywords
- Atomistic Simulation
- Circular Magnetic Dichroism
- Pulse Temperature
- Demagnetization Curve
- High Initial Temperature
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
References
I. Radu et. al., “Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins” Nature 472, 205 (2011).
I. Radu et. al, submitted.
S. Mathias et. al., “Probing the timescale of the exchange interaction in a ferromagnetic alloy” Proc. Nat. Acad. Sci. USA 109, 4792 (2012).
A. J.Schellekens and B.Koopmans, “Microscopic model for ultrafast magnetization dynamics of multisublattice magnets” Phys. Rev. B 87, 020407 (R) (2013).
B. Koopmans, G. Malinowski, F. Dalla Longa, D. Steiauf, M. Fähnle, T. Roth, M. Cinchetti & M. Aeschlimann, “Explaining the paradoxical diversity of ultrafast laser-induced demagnetization” Nature Mat. 9, 259 (2010).
T. Roth, A. J. Schellekens, S. Alebrand, O. Schmitt, D. Steil, B. Koopmans, M. Cinchetti, and M. Aeschlimann, “Temperature Dependence of Laser-Induced Demagnetization in Ni: A Key for Identifying the Underlying Mechanism” Phys. Rev. X, 2, 021006 (2012).
U.Atxitia, P.Nieves and O.Chubykalo-Fesenko, “Landau-Lifshitz-Bloch equation for ferrimagnetic materials” Phys. Rev. B 86, 104414 (2012).
U.Atxitia et. al, submitted.
T. A. Ostler et. al., “Crystallographically amorphous ferrimagnetic alloys: Comparing a localized atomistic spin model with experiments” Phys. Rev.B 84, 024407 (2011).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2015 Springer International Publishing Switzerland
About this paper
Cite this paper
Chubykalo-Fesenko, O., Atxitia, U., Nieves, P., Barker, J., Chantrell, R.W. (2015). Ultrafast Demagnetization Rates in Two-Component Magnetic Materials. In: Bigot, JY., Hübner, W., Rasing, T., Chantrell, R. (eds) Ultrafast Magnetism I. Springer Proceedings in Physics, vol 159. Springer, Cham. https://doi.org/10.1007/978-3-319-07743-7_78
Download citation
DOI: https://doi.org/10.1007/978-3-319-07743-7_78
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-07742-0
Online ISBN: 978-3-319-07743-7
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)