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DOE OSTI · 3373981

Magneto-optical spectroscopy based on pump-probe strobe light

Zhou, Shihao [University of North Carolina, Chapel Hill, NC (United States)]·Zhu, Yujie [University of Wisconsin, Madison, WI (United States)]·Tang, Chunli [Auburn University, AL (United States)]·Sun, Rui [North Carolina State University, Raleigh, NC (United States)]·Wu, Junming [University of North Carolina, Chapel Hill, NC (United States)]·Xiong, Yuzan [University of North Carolina, Chapel Hill, NC (United States); North Carolina A & T State University, Greensboro, NC (United States)] (ORCID:0009000561511300)·Russell, Ingrid E. [University of North Carolina, Chapel Hill, NC (United States)] (ORCID:0009000305767497)·Li, Yi [Argonne National Laboratory (ANL), Argonne, IL (United States)]·Sun, Dali [North Carolina State University, Raleigh, NC (United States)] (ORCID:0000000346623265)·Tsui, Frank [University of North Carolina, Chapel Hill, NC (United States)] (ORCID:0000000287695540)·Yang, Binbin [North Carolina A & T State University, Greensboro, NC (United States)] (ORCID:0000000177556072)·Novosad, Valentine [Argonne National Laboratory (ANL), Argonne, IL (United States)]·Hu, Jia-Mian [University of Wisconsin, Madison, WI (United States)] (ORCID:0000000275796440)·Jin, Wencan [Auburn University, AL (United States)] (ORCID:0000000250878562)·Zhang, Wei [University of North Carolina, Chapel Hill, NC (United States)] (ORCID:0000000258783090)
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Abstract

Here, we demonstrate a pump-probe strobe light spectroscopy for sensitive detection of magneto-optical dynamics in the context of hybrid magnonics. The technique uses a combinatorial microwave-optical pump-probe scheme, leveraging both the high-energy resolution of microwaves and high-efficiency detection using optical photons. In contrast with conventional stroboscopy using continuous-wave light, we apply microwave and optical pulses with varying pulse widths, and demonstrate magneto-optical detection of magnetization dynamics in Y 3 Fe 5 O 12 films. The detected magneto-optical signals depend strongly on the characteristics of both the microwave and the optical pulses, as well as their relative time delays. We show that good magneto-optical sensitivity and coherent stroboscopic character are maintained, even at a microwave pump pulse of 1.5 ns and an optical probe pulse of 80 ps, under a 7 MHz clock rate, corresponding to a pump-probe footprint of approximately 1% in one detection cycle. Our results show that time-dependent strobe light measurement of magnetization dynamics can be achieved in the gigahertz frequency range under a pump-probe detection scheme.

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36 MATERIALS SCIENCEmagneto-opticsmagnonsspectroscopy

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Zhou, Shihao [University of North Carolina, Chapel Hill, NC (United States)], Zhu, Yujie [University of Wisconsin, Madison, WI (United States)], Tang, Chunli [Auburn University, AL (United States)], Sun, Rui [North Carolina State University, Raleigh, NC (United States)], Wu, Junming [University of North Carolina, Chapel Hill, NC (United States)], Xiong, Yuzan [University of North Carolina, Chapel Hill, NC (United States); North Carolina A & T State University, Greensboro, NC (United States)] (ORCID:0009000561511300), Russell, Ingrid E. [University of North Carolina, Chapel Hill, NC (United States)] (ORCID:0009000305767497), Li, Yi [Argonne National Laboratory (ANL), Argonne, IL (United States)], Sun, Dali [North Carolina State University, Raleigh, NC (United States)] (ORCID:0000000346623265), Tsui, Frank [University of North Carolina, Chapel Hill, NC (United States)] (ORCID:0000000287695540), Yang, Binbin [North Carolina A & T State University, Greensboro, NC (United States)] (ORCID:0000000177556072), Novosad, Valentine [Argonne National Laboratory (ANL), Argonne, IL (United States)], Hu, Jia-Mian [University of Wisconsin, Madison, WI (United States)] (ORCID:0000000275796440), Jin, Wencan [Auburn University, AL (United States)] (ORCID:0000000250878562), Zhang, Wei [University of North Carolina, Chapel Hill, NC (United States)] (ORCID:0000000258783090). 2025-11-20. Magneto-optical spectroscopy based on pump-probe strobe light. https://doi.org/10.1103/dj9z-347y

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