H Fukumura

TL;DR: In this paper, all Raman active phonon modes predicted by the group theory were observed at 4-K and assigned by a polarized measurement, and drastic changes of Raman spectra at 600-700 and 1000-1100 K were discussed in combination with magnetic ordering and structural phase transition.

TL;DR: All the 13 Raman-active phonon modes predicted by group theory, 4A(1)+9E, were observed at low temperature and successfully assigned by a polarized Raman measurement, and drastic spectral changes in the Raman spectra were observed.

TL;DR: YMnO(3) is a multiferroic material in which ferroelectric and antiferromagnetic ordering can coexist and spectra for the high-temperature paraelectric phase showed a sudden change at the Curie temperature T(C)>900 K, suggesting an abrupt structural phase change from the ferroElectric to the paraeLECTric phase.

TL;DR: In this paper, ZnO layers doped simultaneously with Ga and N (codoping), and magnetic elements (V, Co) were characterized by Raman scattering to study their structural stability.

TL;DR: In this article, the magnetic frustration behavior of a real multiferroic material, namely YMnO3 epitaxial film, has been investigated and the coupling between the ferroelectric domain switching and the antiferromagnetic spin ordering is demonstrated.