Nonlinear spin control by terahertz-driven anisotropy fields

Baierl, S.; Hohenleutner, M.; Kampfrath, Tobias; Zvezdin, A. K.; Kimel, A. V.; Huber, R.; Mikhaylovskiy, R. V.

doi:10.1038/nphoton.2016.181

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Nonlinear spin control by terahertz-driven anisotropy fields

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Kampfrath, Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Baierl, S., Hohenleutner, M., Kampfrath, T., Zvezdin, A. K., Kimel, A. V., Huber, R., et al. (2016). Nonlinear spin control by terahertz-driven anisotropy fields. Nature Photonics, 10(11), 715-718. doi:10.1038/nphoton.2016.181.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-2437-8

Abstract

Future information technologies, such as ultrafast data recording, quantum computation or spintronics, call for ever faster spin control by light^1-16. Intense terahertz pulses can couple to spins on the intrinsic energy scale of magnetic excitations^5,11. Here, we explore a novel electric dipole-mediated mechanism of nonlinear terahertz-spin coupling that is much stronger than linear Zeeman coupling to the terahertz magnetic field^5,10. Using the prototypical antiferromagnet thulium orthoferrite (TmFeO₃), we demonstrate that resonant terahertz pumping of electronic orbital transitions modifies the magnetic anisotropy for ordered Fe³⁺ spins and triggers large-amplitude coherent spin oscillations. This mechanism is inherently nonlinear, it can be tailored by spectral shaping of the terahertz waveforms and its efficiency outperforms the Zeeman torque by an order of magnitude. Because orbital states govern the magnetic anisotropy in all transition-metal oxides, the demonstrated control scheme is expected to be applicable to many magnetic materials.