A brief discussion of the magnetocaloric effect in thin films of manganite doped with chromium

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dc.creatorCampillo G.
dc.creatorFigueroa A.I.
dc.creatorArnache O.
dc.creatorOsorio J.
dc.creatorMarin Ramirez J.M.
dc.creatorFallarino L.
dc.date2019
dc.date2020-04-29T14:53:53Z
dc.date2020-04-29T14:53:53Z
dc.date.accessioned2023-11-21T14:17:13Z
dc.date.available2023-11-21T14:17:13Z
dc.descriptionIn this work we report on the magnetocaloric effect of La2/3Ca1/3MnO3 (LCMO) and La2/3Ca1/3Mn0.94Cr0.06O3 (LCMCrO) manganite thin films grown by DC magnetron sputtering on LaAlO3 (100) substrates. X-ray diffraction shows that both doped and undoped films crystallize in the orthorhombic structure. Magnetic measurements show a decrease in both the Curie temperature, TC , and the saturation magnetization, MS , for the LCMCrO sample. The change in the magnetic entropy (?Sm ) was extracted from hysteresis loops at different temperatures around the ferromagnetic to paramagnetic transition, displaying a maximum of entropy change (?Sm ) max near TC in both films. Moreover, a shift in (?Sm ) max toward temperatures above TC with increasing magnetic field and a broadening of the entropy change curve were observed. Results of refrigeration cooling power show a lower efficiency for LCMCrO. In order to obtain a local insight into the magnetic interactions of these films, measurements of X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) were performed. XMCD suggests that an antiferromagnetic coupling between Mn4+ - Mn3+ is favored with Cr3+ incorporation, which reduces the Mn L 2,3 XMCD signal and results in a decrease of MS and (?Sm ) max in LCMCrO films. © Published under licence by IOP Publishing Ltd.
dc.identifier17426588
dc.identifierhttp://hdl.handle.net/11407/5754
dc.identifier10.1088/1742-6596/1247/1/012013
dc.identifier.urihttp://repository-salesiana.heoq.net/handle/123456789/232538
dc.languageeng
dc.publisherInstitute of Physics Publishing
dc.publisherFacultad de Ciencias Básicas
dc.publisherFacultad de Ciencias Básicas
dc.relationhttps://www2.scopus.com/inward/record.uri?eid=2-s2.0-85072152021&doi=10.1088%2f1742-6596%2f1247%2f1%2f012013&partnerID=40&md5=9108c1600e516277d7fabeead69f327d
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dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.sourceJournal of Physics: Conference Series
dc.subjectAluminum compounds
dc.subjectChromium
dc.subjectCircular dichroism spectroscopy
dc.subjectDichroism
dc.subjectEngineering research
dc.subjectEntropy
dc.subjectLanthanum compounds
dc.subjectMagnetic materials
dc.subjectMagnetocaloric effects
dc.subjectManganites
dc.subjectSaturation magnetization
dc.subjectX ray absorption spectroscopy
dc.subjectAntiferromagnetic coupling
dc.subjectDc magnetron sputtering
dc.subjectMagnetic interactions
dc.subjectManganite thin films
dc.subjectOrthorhombic structures
dc.subjectParamagnetic transition
dc.subjectRefrigeration cooling
dc.subjectX-ray magnetic circular dichroism
dc.subjectThin films
dc.titleA brief discussion of the magnetocaloric effect in thin films of manganite doped with chromium
dc.typeConference Paper
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeinfo:eu-repo/semantics/article
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