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López Sánchez, Jesús and Campo, Adolfo del and Román sánchez, Sara and Rodríguez de la Fuente, Óscar and Carmona Tejero, Noemí and Serrano, Aída (2022) Large two-magnon Raman hysteresis observed in a magnetically uncompensated hematite coating across the morin transition. Coatings, 12 (4). ISSN 2079-6412
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Official URL: http://dx.doi.org/10.3390/coatings12040540
Abstract
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.
Item Type: | Article |
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Additional Information: | © 2022 by the authors. Licensee MDPI |
Uncontrolled Keywords: | Oxide; Scattering; Films; Temperature; Alpha-Fe_2O_3; Coercivity; Pressure; Epsilon; Light; Metal; Nanoparticulated hematite coating; Confocal Raman microscopy; Two-magnon interaction; Morin transition; Thermal hysteresis |
Subjects: | Sciences > Physics > Materials Sciences > Physics > Solid state physics |
ID Code: | 72144 |
Deposited On: | 23 May 2022 17:13 |
Last Modified: | 24 May 2022 06:49 |
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