RT Journal Article
T1 Large two-magnon Raman hysteresis observed in a magnetically uncompensated hematite coating across the morin transition
A1 López Sánchez, Jesús
A1 Campo, Adolfo del
A1 Román sánchez, Sara
A1 Rodríguez de la Fuente, Óscar
A1 Carmona Tejero, Noemí
A1 Serrano, Aída
AB A temperature-dependent Raman experiment between 80 and 600 K was performed in a nanoparticulated coating of single-phase hematite grown on a silica substrate. In that range, a thermal Raman shift hysteresis was identified in the vibrational modes that accompanies the Morin transition, observing large effects in the two-magnon Raman frequency position and in its relative intensity. Interestingly, no decrease in coercivity occurs when the hematite crosses the Morin transition below 230 K. The spin-flop processes produced in the coating leads to a strong decompensation of the surface spins, generating a ferromagnetic component over the whole temperature range studied. Such unusual effects might be promoted by a certain degree of structural disorder and the stresses produced by the nanoparticulation growth approach of the hematite coating. As a result, a high stability of the two-magnon excitation is obtained over a wide temperature range and considerable advances are made for the development of spintronic devices based on semiconductor antiferromagnetic materials.
PB MDPI
SN 2079-6412
YR 2022
FD 2022-04-17
LK https://hdl.handle.net/20.500.14352/71439
UL https://hdl.handle.net/20.500.14352/71439
LA eng
NO © 2022 by the authors. Licensee MDPIThe present work has been supported by the Ministerio Español de Ciencia e Innovación (MICINN) and the Consejo Superior de Investigaciones Cientificas (CSIC) through the projects PIE-2010-OE-013-200014, PIE 2021-60-E-030, and RTI2018-095303-A-C52. A.S. acknowledges financial support from the program “Atracción de Talento Investigador” Contract (2017-t2/IND5395, Comunidad de Madrid).
NO Ministerio de Ciencia e Innovación (MICINN)/ FEDER
NO Ministerio de Ciencia e Innovación (MICINN)
NO Comunidad de Madrid
DS Docta Complutense
RD 30 abr 2024