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Proceedings Paper

Ultrafast spin dynamics in a magnetically doped topological insulator CrxBi2-xTe3: the inverse Overhauser and spin-phonon relaxation (Conference Presentation)
Author(s): Liang Luo; Zhaoyu Liu; Vagharsh Mkhitaryan; Di Cheng; Xu Yang; Chirag Vaswani; Yan Ni; Zhen Zhang; Ilias E. Perakis; David C. Jiles; Jigang Wang
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Paper Abstract

Magnetically doped topological insulators (TIs) attract a great deal of interest for both fundamental scientific studies and potential applications. These systems are promising for the realization of quantum anomalous Hall effect, and more generally, for the potentially controllable magnetism, which can underlay many useful technological applications. Here, we reveal the first photoinduced magnetization dynamics in a 40 nm thin film of magnetically doped TIs, CrxBi2-xTe3 with x=0.29 using femtosecond time-resolved magneto-optical Kerr effect (MOKE) spectroscopy. The ultrafast spin dynamics of the sample at low temperature 5 K is characterized by two demagnetization dynamics, attributed to spin-spin (~0.5 ps) and spin-phonon (~10 ps) scatterings, respectively, followed by a slow recovery process with 100s of ps time scale. While it gets faster at elevated temperature and finally vanishes above ~ 90 K, much higher than the reported Curie temperature Tc~23.8 K, due to strong Van Vleck magnetic susceptibility in the magnetically doped TIs system, distinct from the case of GaMnAs. In addition to providing implications for deeper understanding of spin dynamics in magnetically doped TI systems, the study will potentially benefit the development of magnetic TIs-based spintronic devices.

Paper Details

Date Published: 18 September 2018
Proc. SPIE 10732, Spintronics XI, 107320S (18 September 2018); doi: 10.1117/12.2326678
Show Author Affiliations
Liang Luo, Iowa State Univ. (United States)
Zhaoyu Liu, Iowa State Univ. (United States)
Vagharsh Mkhitaryan, Iowa State Univ. (United States)
Di Cheng, Iowa State Univ. (United States)
Xu Yang, Iowa State Univ. (United States)
Chirag Vaswani, Iowa State Univ. (United States)
Yan Ni, Iowa State Univ. (United States)
Zhen Zhang, Iowa State Univ. (United States)
Ilias E. Perakis, Univ. of Alabama at Birmingham (United States)
David C. Jiles, Iowa State Univ. (United States)
Jigang Wang, Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 10732:
Spintronics XI
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi; Henri Jaffrès, Editor(s)

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