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Disorder-induced Room Temperature Ferromagnetism in Glassy Chromites
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 4, s. 4686-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We report an unusual robust ferromagnetic order above room temperature upon amorphization of perovskite [YCrO3] in pulsed laser deposited thin films. This is contrary to the usual expected formation of a spin glass magnetic state in the resulting disordered structure. To understand the underlying physics of this phenomenon, we combine advanced spectroscopic techniques and first-principles calculations. We find that the observed order-disorder transformation is accompanied by an insulator-metal transition arising from a wide distribution of Cr-O-Cr bond angles and the consequent metallization through free carriers. Similar results also found in YbCrO3-films suggest that the observed phenomenon is more general and should, in principle, apply to a wider range of oxide systems. The ability to tailor ferromagnetic order above room temperature in oxide materials opens up many possibilities for novel technological applications of this counter intuitive effect.

sted, utgiver, år, opplag, sider
2014. Vol. 4, s. 4686-
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Identifikatorer
URN: urn:nbn:se:kth:diva-145262DOI: 10.1038/srep04686ISI: 000334286200001Scopus ID: 2-s2.0-84926453514OAI: oai:DiVA.org:kth-145262DiVA, id: diva2:717658
Forskningsfinansiär
VinnovaSwedish Research CouncilCarl Tryggers foundation Knut and Alice Wallenberg FoundationSwedish Energy Agency
Merknad

QC 20140516

Tilgjengelig fra: 2014-05-16 Laget: 2014-05-15 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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