Ultrafast spin polarization in a multiferroic manganite BiFe0.5Mn0.5O3 thin film

作者：Zhang, Z. Y.^*; Jin, Z. M.; Lin, X.; Cheng, Z. X.; Zhao, H. Y.; Kimura, H.; Ma, G. H.

来源：EPL, 2015, 112(3): 37007.

DOI：10.1209/0295-5075/112/37007

• DYNAMICS

In this work, we present observations of ultrafast carrier dynamics and spin polarization in a multiferroic manganite BiFe0.5Mn0.5O3 film excited by linearly and circularly polarized femtosecond pulses, respectively. The d-band charge transfer transition is reasonably assigned to Gamma(3) --> Gamma(5). The transient reflectivity decay on a time scale as fast as only 0.3 ps is consistent with the picture of ultrafast electron-phonon coupling. The ultrafast switching of polarization ellipticity (< 150 fs) originates from a transient coherent spin polarization by optical orientation. The ultrafast spin polarization switching is assigned to the Raman coherence process.

• 出版日期2015-11
• 单位武汉工程大学; 上海大学