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Keywords = nanoparticulated hematite coating

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14 pages, 3497 KB  
Article
Large Two-Magnon Raman Hysteresis Observed in a Magnetically Uncompensated Hematite Coating across the Morin Transition
by Jesús López-Sánchez, Adolfo del Campo, Sara Román-Sánchez, Óscar Rodríguez de la Fuente, Noemí Carmona and Aída Serrano
Coatings 2022, 12(4), 540; https://doi.org/10.3390/coatings12040540 - 17 Apr 2022
Cited by 12 | Viewed by 4010
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 [...] Read more.
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. Full article
(This article belongs to the Section Ceramic Coatings and Engineering Technology)
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