What question did this study set out to answer?

Develop and validate a terahertz spintronic magnetometry technique to probe in-plane magnetization in ferromagnetic thin films using ultrafast optical excitation.

April 18, 2022Applied Physics LettersOpen Access

Terahertz spintronic magnetometer (TSM)

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Authors

PAP. C. AgarwalAgency for Science, Technology and Research YYYingshu YangNanyang Technological University JLJames LourembamAgency for Science, Technology and Research

Discussion

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Implication

Experimental study demonstrates ultrafast in-plane magnetization detection in ferromagnetic heterostructures via terahertz emission, highlighting a rapid spintronic characterization tool.

Key Points

Develop and validate a terahertz spintronic magnetometry technique to probe in-plane magnetization in ferromagnetic thin films using ultrafast optical excitation.
Excited ferromagnetic/heavy-metal thin-film heterostructures with femtosecond optical pulses to generate spin currents and terahertz radiation.
Measured emitted terahertz pulse amplitudes across swept magnetic fields and compared hysteresis loops against vibrating-sample magnetometer measurements.
Modeled terahertz pulse propagation through the heterostructure using a modified transfer-matrix method to evaluate the relationship between pulse amplitude and sample magnetization.
Hysteresis loops recorded by sweeping terahertz pulse amplitudes as a function of the magnetic field demonstrated close agreement with vibrating-sample magnetometer data.
Transfer-matrix modeling established a direct linear relationship between the emitted terahertz pulse amplitude and in-plane sample magnetization.

Cite This Study

Agarwal et al. (2022) studied this question.

synapsesocial.com/papers/6a6f3d7b26770c2b8ddfe6db https://doi.org/10.1063/5.0079989

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Implication

Experimental study demonstrates ultrafast in-plane magnetization detection in ferromagnetic heterostructures via terahertz emission, highlighting a rapid spintronic characterization tool.