Growing demands for ultra-fast switching of spins have turned attention to optically controlled spintronics, which indeed has recently been demonstrated promising. Here we report localized spin-flip excitations revealed by resonance inelastic light scattering on hexagonal holmium manganite thin films with the magnetic manganese ions substituted by the nonmagnetic gallium ions (HoMn1 − xGaxO3). Our analyses on a broad Raman peak support that the corresponding spin excitation is associated with flipping of all three Mn3+ spins in the elementary trimer of manganese ions and hence maintains the same excitation energy determined by the intrinsic spin–spin interaction between Mn3+ ions. The nonmagnetic gallium ions only reduce the population of the spin excitations by breaking the spin-frustrated triangular network. Such localized spin-flip excitations show another promise towards optically controlled spin devices.
Bibliographical noteFunding Information:
I. ‐S. Y. acknowledges the financial support by the National Research Foundation of Korea (NRF) grant funded by the Korean government (Grant No. 2017R1A2B2009309). N. T. M. H. was supported by the fund of Graduate University of Science and Technology under grant number GUST.STS.ĐT2017‐VL02. X. ‐B. C. was funded by the National Natural Science Foundation of China (Grant No. 11574241). M. ‐S. C. was supported by the National Research Foundation of Korea (Grant Nos. 2017R1E1A1A03070681 and 2018R1A4A1024157). D. L. and T. W. N. were supported by the Research Center Program of the Institute for Basic Science (IBS) in Korea (Grant No. IBS‐R009‐D1).
© 2020 John Wiley & Sons, Ltd.
- hexagonal HoMnO
- resonance Raman spectroscopy
- spin-flip excitations
- spin-frustrated triangular network