| dc.contributor.author | COEY, JOHN | en |
| dc.date.accessioned | 2014-04-30T12:34:18Z | |
| dc.date.available | 2014-04-30T12:34:18Z | |
| dc.date.issued | 2012 | en |
| dc.date.submitted | 2012 | en |
| dc.identifier.citation | Yu, GQ, Feng, JF, Kurt, H, Liu, HF, Han, XF, Coey, JMD, Field sensing in MgO double barrier magnetic tunnel junctions with a superparamagnetic Co50Fe50 free layer, Journal of Applied Physics, 111, 2012, 113906- | en |
| dc.identifier.other | Y | en |
| dc.description | PUBLISHED | en |
| dc.description.abstract | Linear response and low frequency noise have been investigated in MgO double barrier magnetic tunnel junctions with a superparamagnetic Co50Fe50 free layer. Linear and hysteresis-free switching was observed for the Co50Fe50 thickness t ≤ 1 nm. A tunneling magnetoresistance ratio of up to 108% and large magnetic field sensitivity value of 61%/mT were obtained at room temperature when t = 1 nm. The angular dependence of magnetoresistance suggests that weak coupling between superparamagneticislands in a t ≤ 1 nm free layer permits continuous rotation of magnetization, whereas the islands in a 0.8nm layer switch rather independently. The frequency dependence of noise power spectrum density and field dependence of Hooge parameter(a) also behave differently for junctions with 0.8 and 1.0nm free layers. The noise sensitivity of 1.0nm free layer junctions is independent of bias, and it is estimated to reach 400 pT/Hz0.5 at 500?kHz | en |
| dc.description.sponsorship | This work was supported by SFI as part of the MANSE
project 2005/IN/1850 and was conducted under the frame-
work of the INSPIRE programme, funded by the Irish
Government?s Programme for Research in Third Level Insti-
tutions, Cycle 4, National Development Plan 2007-2013.
This work was also supported by the Ireland-China Joint
Research Project between SFI and MOST. We are also grate-
ful for the partial support of the State Key Project of Funda-
mental Research of Ministry of Science and Technology
(MOST, Grant No. 2010CB934400), National Natural Sci-
ence Foundation of China (NSFC, Grant No. 10934099 and
51021061), the partial support of Graduate Education Project | en |
| dc.format.extent | 113906 | en |
| dc.language.iso | en | en |
| dc.relation.ispartofseries | Journal of Applied Physics | en |
| dc.relation.ispartofseries | 111 | en |
| dc.rights | Y | en |
| dc.subject | Physics | en |
| dc.title | Field sensing in MgO double barrier magnetic tunnel junctions with a superparamagnetic Co50Fe50 free layer | en |
| dc.type | Journal Article | en |
| dc.type.supercollection | scholarly_publications | en |
| dc.type.supercollection | refereed_publications | en |
| dc.identifier.peoplefinderurl | http://people.tcd.ie/jcoey | en |
| dc.identifier.rssinternalid | 93663 | en |
| dc.identifier.doi | http://dx.doi.org/10.1063/1.4723836 | en |
| dc.rights.ecaccessrights | OpenAccess | |
| dc.contributor.sponsor | Science Foundation Ireland (SFI) | en |
| dc.contributor.sponsorGrantNumber | 2005/IN/1850 | en |
| dc.identifier.uri | http://hdl.handle.net/2262/69116 | |
