Ultrafast spin dynamics in a magnetically doped topological insulator CrxBi2-xTe3: the inverse Overhauser and spin-phonon relaxation (Conference Presentation)

Liang Luo; Zhaoyu Liu; Vagharsh Mkhitaryan; Di Cheng; Xu Yang; Chirag Vaswani; Yan Ni; Zhen Zhang; Ilias E. Perakis; David C. Jiles; Jigang Wang

doi:10.1117/12.2326678

18 September 2018 Ultrafast spin dynamics in a magnetically doped topological insulator CrxBi2-xTe3: the inverse Overhauser and spin-phonon relaxation (Conference Presentation)

Liang Luo, Zhaoyu Liu, Vagharsh Mkhitaryan, Di Cheng, Xu Yang, Chirag Vaswani, Yan Ni, Zhen Zhang, Ilias E. Perakis, David C. Jiles, Jigang Wang

Author Affiliations +

Proceedings Volume 10732, Spintronics XI; 107320S (2018) https://doi.org/10.1117/12.2326678
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

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.

Conference Presentation

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Liang Luo, Zhaoyu Liu, Vagharsh Mkhitaryan, Di Cheng, Xu Yang, Chirag Vaswani, Yan Ni, Zhen Zhang, Ilias E. Perakis, David C. Jiles, and Jigang Wang "Ultrafast spin dynamics in a magnetically doped topological insulator CrxBi2-xTe3: the inverse Overhauser and spin-phonon relaxation (Conference Presentation)", Proc. SPIE 10732, Spintronics XI, 107320S (18 September 2018); https://doi.org/10.1117/12.2326678

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KEYWORDS

Spin dynamics

Ultrafast phenomena

Magnetism

Picosecond phenomena

Femtosecond phenomena

Kerr effect

Magneto-optics

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