Impact of the surface phase transition on magnon and phonon excitations in BiFeO3 nanoparticles

Autor:	Aupiais, Ian, Hemme, Pierre, Allen, Marc, Scida, Alexis, Lu, Xiao, Ricolleau, Christian, Gallais, Yann, Sacuto, Alain, Wong, Stanislaus, de Sousa, Rogério, Cazayous, Maximilien
Rok vydání:	2020
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science
Zdroj:	Appl. Phys. Lett. 116, 172903 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1063/5.0003853
Popis:	We have performed Raman scattering measurements on BiFeO3 nanoparticles and studied both magnetic and lattice modes. We reveal strong anomalies between 140 K and 200 K in the frequency of magnon and E(LO1), E(TO1) and A1(LO1) phonon modes. These anomalies are related to a surface expansion and are enhanced for nanoparticle sizes approaching the spin cycloidal length. These observations point out the strong interplay between the surface, the lattice, and the magnetism for sizes of BiFeO3 nanoparticles close to the cycloid periodicity. Comment: 5 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2004.06028 Zobrazit plný text záznamu View this record from Arxiv