DC Field | Value | Language |
---|---|---|
dc.contributor.author | Yang, ZH | - |
dc.contributor.author | Kent, TF | - |
dc.contributor.author | Yang, J | - |
dc.contributor.author | Jin, HY | - |
dc.contributor.author | Heremans, JP | - |
dc.contributor.author | Myers, RC | - |
dc.date.accessioned | 2017-07-19T13:00:02Z | - |
dc.date.available | 2017-07-19T13:00:02Z | - |
dc.date.created | 2016-12-30 | - |
dc.date.issued | 2015-12-11 | - |
dc.identifier.issn | 1098-0121 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/36751 | - |
dc.description.abstract | Here we report on the effect of rare-earth Gd doping on the magnetic properties and magnetotransport of GaN two-dimensional electron gasses (2DEGs). Samples are grown by plasma-assisted molecular-beam epitaxy and consist of AlN/GaN heterostructures where Gd is delta doped within a polarization-induced 2DEG. Ferromagnetism is observed in these Gd-doped 2DEGs with a Curie temperature above room temperature and an anisotropic spontaneous magnetization preferring an out-of-plane (c-axis) orientation. At magnetic fields up to 50 kOe, the magnetization remains smaller for the in-plane configuration than for the out-of-plane configuration, which is indicative of exchange-coupled spins locked along the polar c axis. The sample with the lowest Gd concentration (2.3 x 10(14) cm(-2)) exhibits a saturation magnetization of 41.1 mu(B)/Gd3+ at 5 K revealing that the Gd ion spins (7 mu(B)) alone do not account for the magnetization. Surprisingly, control samples grown without any Gd display inconsistent magnetic properties; in some control samples weak ferromagnetism is observed, and in others paramagnetism is observed. The ferromagnetic 2DEGs do not exhibit the anomalous Hall effect; the Hall resistance varies nonlinearly with the magnetic field but does not track the magnetization, indicating the lack of coupling between the ferromagnetic phase and the conduction-band electrons within the 2DEG. | - |
dc.language | English | - |
dc.publisher | American Physical Society | - |
dc.relation.isPartOf | Physical Review B | - |
dc.title | Anisotropic defect-induced ferromagnetism and transport in Gd-doped GaN two-dimensional electron gasses | - |
dc.type | Article | - |
dc.identifier.doi | 10.1103/PHYSREVB.92.224416 | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | Physical Review B, v.92, no.22, pp.224416 | - |
dc.identifier.wosid | 000366168600003 | - |
dc.date.tcdate | 2018-03-23 | - |
dc.citation.number | 22 | - |
dc.citation.startPage | 224416 | - |
dc.citation.title | Physical Review B | - |
dc.citation.volume | 92 | - |
dc.contributor.affiliatedAuthor | Jin, HY | - |
dc.identifier.scopusid | 2-s2.0-84950335597 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.scptc | 0 | * |
dc.date.scptcdate | 2018-05-121 | * |
dc.type.docType | Article | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Physics, Applied | - |
dc.relation.journalWebOfScienceCategory | Physics, Condensed Matter | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Physics | - |
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