Abstract
We have studied the response of the exchange split valence bands of ferromagnetic gadolinium tofemtosecond laser excitation. We observe a drop of the exchange splitting with a time constant of 0.9 ps but different response times of minority and majority spin bands. Furthermore, even above the Curie temperature there is a finite exchange splitting, which also decreases with laser excitation.
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References
E. Beaurepaire, J.-C.Merle, A. Daunois, and J.-Y. Bigot, “Ultrafast Spin Dynamics in Ferromagnetic Nickel” Phys. Rev. Lett. 76, 4250 (1996).
I. Radu et al., “Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins” Nature 472, 205 (2011).
J.-Y. Bigot, M. Vomir, and E. Beaurepaire, “Coherent ultrafast magnetism induced by femtosecond laser pulses” Nature Physics 5, 515 (2009).
M. Krauß et al., “Ultrafast demagnetization of ferromagnetic transition metals: The role of the Coulomb interaction” Phys. Rev. B 80, 180407 (2009).
B. Koopmans et al., “Explaining the paradoxical diversity of ultrafast laser-induced demagnetization” Nature Mater. 9, 259–265 (2010).
A.B. Schmidt et al., „Ultrafast Magnon Generation in an Fe Film on Cu(100)“ Phys. Rev. Lett. 105, 197401 (2010).
M. Battiato, K. Carva, and P. M. Oppeneer, “Superdiffusive Spin Transport as a Mechanism of Ultrafast Demagnetization” Phys. Rev. Lett.105, 027203 (2010).
A. J. Schellekens and B. Koopmans, “Comparing Ultrafast Demagnetization Rates Between Competing Models for Finite Temperature Magnetism” Phys. Rev. Lett. 110, 217204 (2013); K. Carva, M. Battiato, D. Legut, and P. M. Oppeneer, “Ab initio theory of electron-phonon mediated ultrafast spin relaxation of laser-excited hot electrons in transition-metal ferromagnets” Phys. Rev. B 87, 184425 (2013).
B. Frietsch et al., “A high-order harmonic generation apparatus for time- and angle-resolved photoelectron spectroscopy” Rev. Sci. Instrum.84 (2013), in press.
R. Carley et al., “Femtosecond Laser Excitation Drives Ferromagnetic Gadolinium out of magnetic Equilibrium” Phys. Rev. Lett. 109, 057401 (2012).
C. Schüßler-Langeheine, “Magnetic properties of thin films of heavy lanthanide metals studied by magnetic x-ray diffraction and high-resolution photoemission,” Ph.D. thesis, Fachbereich Physik, Freie Universität Berlin, 1999.
M. Sultan et al., “Electron- and phonon-mediated ultrafast magnetization dynamics of Gd(0001)”, Phys. Rev. B 85, 184407 (2012).
M. Wietsruk et al., “Hot-electron-driven enhancement of spin-lattice coupling in Gd and Tb 4f ferromagnets observed by Femtosecond X-ray magnetic circular dichroism” Phys. Rev. Lett. 106, 127401 (2011).
M.Avignon and K.-H. Bennemann, http://arxiv.org/pdf/1305.5698.pdf.
K. Maiti, M. C. Malagoli, A. Dallmeyer, and C. Carbone, “Finite Temperature Magnetism in Gd: Evidence against a Stoner Behavior” Phys Rev. Lett. 88, 167205 (2002).
M. Bode, M. Getzlaff, A. Kubetzka, R. Pascal, O. Pietzsch, and R. Wiesendanger, “Temperature-Dependent Exchange Splitting of a Surface Stateon a Local-Moment Magnet: Tb(0001)”, Phys. Rev. Lett. 83, 3017 (1999).
Acknowledgments
We gratefully acknowledge funding by the Deutsche Forschungsgemeinschaft, the Leibniz graduate school D in L, and the Helmholtz Virtual Institute Dynamic Pathways in Multidimensional Landscapes. J.B. is indebted to the Humboldt Foundation for a scholarship.
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Frietsch, B., Bowlan, J., Carley, R., Teichmann, M., Wolter, J., Weinelt, M. (2015). The Valence Band Structure of Gadolinium Studied with Time-Resolved Photoemission. 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_85
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DOI: https://doi.org/10.1007/978-3-319-07743-7_85
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