DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kashir, Alireza | ko |
dc.contributor.author | Goian, Veronica | ko |
dc.contributor.author | Yoon, Daseob | ko |
dc.contributor.author | Cho, Byeong-Gwan | ko |
dc.contributor.author | Jeong, Yoon Hee | ko |
dc.contributor.author | Lee, Gil-Ho | ko |
dc.contributor.author | Kamba, Stanislav | ko |
dc.date.accessioned | 2021-03-26T02:15:31Z | - |
dc.date.available | 2021-03-26T02:15:31Z | - |
dc.date.created | 2020-08-10 | - |
dc.date.issued | 2020-09 | - |
dc.identifier.citation | JOURNAL OF PHYSICS-CONDENSED MATTER, v.32, no.40 | - |
dc.identifier.issn | 0953-8984 | - |
dc.identifier.uri | http://hdl.handle.net/10203/281911 | - |
dc.description.abstract | NiO thin films with various strains were grown on SrTiO3(STO) and MgO substrates using a pulsed laser deposition technique. The films were characterized using an x-ray diffraction, atomic force microscopy, and infrared reflectance spectroscopy. The films grown on STO (001) substrate show a compressive in-plane strain which increases as the film thickness is reduced resulting in an increase of the NiO phonon frequency. On the other hand, a tensile strain was detected in the NiO film grown on MgO (001) substrate which induces a softening of the phonon frequency. Overall, the variation of in-plane strain from -0.36% (compressive) to 0.48% (tensile) yields the decrease of the phonon frequency from 409.6 cm(-1)to 377.5 cm(-1)which occurs due to the similar to 1% change of interatomic distances. The magnetic exchange-driven phonon splitting Delta omega in three different samples, with relaxed (i.e. zero) strain, 0.36% compressive strain and 0.48% tensile strain, was measured as a function of temperature. The Delta omega increases on cooling in NiO relaxed film as in the previously published work on a bulk crystal. The splitting increases on cooling also in 0.48% tensile strained film, but Delta omega is systematically 3-4 cm(-1)smaller than in relaxed film. Since the phonon splitting is proportional to the non-dominant magnetic exchange interactionJ(1), the reduction of phonon splitting in tensile-strained film was explained by a diminishing ofJ(1)with lattice expansion. Increase of Delta omega on cooling can be also explained by rising ofJ(1)with reduced temperature. | - |
dc.language | English | - |
dc.publisher | IOP PUBLISHING LTD | - |
dc.title | Strain effect on magnetic-exchange-induced phonon splitting in NiO films | - |
dc.type | Article | - |
dc.identifier.wosid | 000551798500001 | - |
dc.identifier.scopusid | 2-s2.0-85088022774 | - |
dc.type.rims | ART | - |
dc.citation.volume | 32 | - |
dc.citation.issue | 40 | - |
dc.citation.publicationname | JOURNAL OF PHYSICS-CONDENSED MATTER | - |
dc.identifier.doi | 10.1088/1361-648X/ab9f08 | - |
dc.contributor.nonIdAuthor | Kashir, Alireza | - |
dc.contributor.nonIdAuthor | Goian, Veronica | - |
dc.contributor.nonIdAuthor | Yoon, Daseob | - |
dc.contributor.nonIdAuthor | Cho, Byeong-Gwan | - |
dc.contributor.nonIdAuthor | Lee, Gil-Ho | - |
dc.contributor.nonIdAuthor | Kamba, Stanislav | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | exchange coupling | - |
dc.subject.keywordAuthor | phonons | - |
dc.subject.keywordAuthor | infrared spectroscopy | - |
dc.subject.keywordAuthor | thin films | - |
dc.subject.keywordPlus | TRANSITION | - |
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