Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics

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Induced versus intrinsic magnetic moments in ultrafast magnetization dynamics

M. Hofherr, S. Moretti, J. Shim, S. Häuser, N. Y. Safonova, M. Stiehl, A. Ali, S. Sakshath, J. W. Kim, D. H. Kim, H. J. Kim, J. I. Hong, H. C. Kapteyn, M. M. Murnane, M. Cinchetti, D. Steil, S. Mathias, B. Stadtmüller, M. Albrecht, D. E. Kim, U. Nowak, and M. Aeschlimann

Phys. Rev. B 98, 174419 – Published 14 November 2018

Abstract

Ferromagnetic metal alloys are today commonly used in spintronic and magnetic data storage devices. These multicompound structures consist of several magnetic sublattices exhibiting both intrinsic and induced magnetic moments. Here, we study the response of the element-specific magnetization dynamics for thin film systems based on purely intrinsic (CoFeB) and partially induced (FePt) magnetic moments using extreme ultraviolet pulses from high-harmonic generation (HHG) as an element-sensitive probe. In FePt, on the one hand, we observe an identical normalized transient magnetization for Fe and Pt throughout both the ultrafast demagnetization and the subsequent remagnetization. On the other hand, Co and Fe show a clear difference in the asymptotic limit of the remagnetization process in CoFeB, which is supported by calculations for the temperature-dependent behavior of the equilibrium magnetization using a dynamic spin model. Thus, in this work, we provide a vital step toward a comprehensive understanding of ultrafast light-induced magnetization dynamics in ferromagnetic alloys with sublattices of intrinsic and induced magnetic moments.

Received 1 August 2018
Revised 25 September 2018

DOI:https://doi.org/10.1103/PhysRevB.98.174419

Physics Subject Headings (PhySH)

Exchange interaction Ultrafast magnetization dynamics

Alloys

High-harmonic generation Magneto-optical Kerr effect Multiscale modeling

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Hofherr^1,2,*, S. Moretti³, J. Shim^4,5, S. Häuser¹, N. Y. Safonova⁶, M. Stiehl¹, A. Ali^4,5, S. Sakshath¹, J. W. Kim^5,7, D. H. Kim⁸, H. J. Kim⁹, J. I. Hong⁹, H. C. Kapteyn¹⁰, M. M. Murnane¹⁰, M. Cinchetti¹¹, D. Steil¹², S. Mathias¹², B. Stadtmüller^1,2, M. Albrecht⁶, D. E. Kim^4,5, U. Nowak³, and M. Aeschlimann¹

¹Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, Erwin-Schroedinger Strasse 46, 67663 Kaiserslautern, Germany
²Graduate School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany
³Universität Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany
⁴Department of Physics & Center for Attosecond Science and Technology, POSTECH, Pohang 37673, South Korea
⁵Max Planck POSTECH/KOREA Research Initiative, Pohang 37673, South Korea
⁶Institute of Physics, University of Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
⁷Department of Physics, Kunsan National University, Kunsan 54150, South Korea
⁸Department of Physics, Chungbuk National University, Cheongju 28644, South Korea
⁹Department of Emerging Materials Science, DGIST, Daegu 42988, South Korea
¹⁰Department of Physics and JILA, University of Colorado and NIST, Boulder, Colorado 80309, USA
¹¹Experimentelle Physik VI, Technische Universität Dortmund, 44221 Dortmund, Germany
¹²Georg-August-Universität Göttingen, I. Physikalisches Institut, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

^*m.hofherr@physik.uni-kl.de

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Issue

Vol. 98, Iss. 17 — 1 November 2018

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