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dc.contributor.CRUESPUNIVERSIDADE ESTADUAL DE CAMPINASpt_BR
dc.contributor.authorunicampCoelho, Adelino de Aguiarpt_BR
dc.typeArtigopt_BR
dc.titleHigh spin polarization and spin splitting in equiatomic quaternary CoFeCrAl Heusler alloypt_BR
dc.contributor.authorBainsla, L.pt_BR
dc.contributor.authorMallick, A. I.pt_BR
dc.contributor.authorCoelho, A. A.pt_BR
dc.contributor.authorNigam, A. K.pt_BR
dc.contributor.authorVaraprasad, B. S. D. Ch. S.pt_BR
dc.contributor.authorTakahashi, Y. K.pt_BR
dc.contributor.authorAlam, A.pt_BR
dc.contributor.authorSuresh, K. G.pt_BR
dc.contributor.authorHono, K.pt_BR
dc.subjectSpintrônicapt_BR
dc.subjectCálculos ab initiopt_BR
dc.subjectMagnetoresistênciapt_BR
dc.subject.otherlanguageSpintronicspt_BR
dc.subject.otherlanguageAb initio calculationspt_BR
dc.subject.otherlanguageMagnetoresistancept_BR
dc.description.abstractIn this paper, we investigate CoFeCrAl alloy by means of ab-initio electronic structure calculations and various experimental techniques. The alloy is found to exist in the B2-type cubic Heusler structure, which is very similar to Y-type (or LiMgPdSn prototype) structure with space group F-43m (#216). Saturation magnetization (M-S) of about 2 mu(B)/f.u. is observed at 8 K under ambient pressure, which is in good agreement with the Slater-Pauling rule. M-S values are found to be independent of pressure, which is a prerequisite for half-metals. The ab-initio electronic structure calculations predict half-metallicity for the alloy with a spin slitting energy of 0.31 eV. Importantly, this system shows a high current spin polarization value of 0.67 +/- 0.02, as deduced from the point contact Andreev reflection measurements. Linear dependence of electrical resistivity with temperature indicates the possibility of reasonably high spin polarization at elevated temperatures (similar to 150 K) as well. All these suggest that CoFeCrAl is a promising material for the spintronic devices. (C) 2015 Elsevier B.V. All rights reserved.en
dc.description.abstractIn this paper, we investigate CoFeCrAl alloy by means of ab-initio electronic structure calculations and various experimental techniques. The alloy is found to exist in the B2-type cubic Heusler structure, which is very similar to Y-type (or LiMgPdSn prototype) structure with space group F-43m (#216). Saturation magnetization (M-S) of about 2 mu(B)/f.u. is observed at 8 K under ambient pressure, which is in good agreement with the Slater-Pauling rule. M-S values are found to be independent of pressure, which is a prerequisite for half-metals. The ab-initio electronic structure calculations predict half-metallicity for the alloy with a spin slitting energy of 0.31 eV. Importantly, this system shows a high current spin polarization value of 0.67 +/- 0.02, as deduced from the point contact Andreev reflection measurements. Linear dependence of electrical resistivity with temperature indicates the possibility of reasonably high spin polarization at elevated temperatures (similar to 150 K) as well. All these suggest that CoFeCrAl is a promising material for the spintronic devices.pt_BR
dc.relation.ispartofJournal of magnetism and magnetic materialspt_BR
dc.relation.ispartofabbreviationJ. magn. magn. mater.pt_BR
dc.publisher.cityAmsterdampt_BR
dc.publisher.countryHolandapt_BR
dc.publisherElsevierpt_BR
dc.date.issued2015pt_BR
dc.date.monthofcirculationNov.pt_BR
dc.identifier.citationHigh Spin Polarization And Spin Splitting In Equiatomic Quaternary Cofecral Heusler Alloy. Elsevier Science Bv, v. 394, p. 82-86 Nov-2015.pt_BR
dc.language.isoengpt_BR
dc.description.volume394pt_BR
dc.description.firstpage82pt_BR
dc.description.lastpage86pt_BR
dc.rightsfechadopt_BR
dc.sourceWOSpt_BR
dc.identifier.issn0304-8853pt_BR
dc.identifier.eissn1873-4766pt_BR
dc.identifier.doi10.1016/j.jmmm.2015.05.095pt_BR
dc.identifier.urlhttps://www.sciencedirect.com/science/article/pii/S0304885315302080pt_BR
dc.description.sponsorshipSem informaçãopt_BR
dc.description.sponsorship1Sem informaçãopt_BR
dc.description.sponsordocumentnumberSem informaçãopt_BR
dc.date.available2016-06-07T13:16:36Z-
dc.date.accessioned2016-06-07T13:16:36Z-
dc.description.provenanceMade available in DSpace on 2016-06-07T13:16:36Z (GMT). No. of bitstreams: 1 wos_000360025800014.pdf: 1764074 bytes, checksum: 2efc2139b5552ef9feab364d5528fd3e (MD5) Previous issue date: 2015 Bitstreams deleted on 2020-09-02T13:39:57Z: wos_000360025800014.pdf,. Added 1 bitstream(s) on 2020-09-02T13:43:57Z : No. of bitstreams: 1 000360025800014.pdf: 1836054 bytes, checksum: da5607885557fd9a217602c53b204159 (MD5)en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/242129-
dc.contributor.departmentDepartamento de Física Aplicadapt_BR
dc.contributor.unidadeInstituto de Física Gleb Wataghinpt_BR
dc.subject.keywordHeusler alloyspt_BR
dc.subject.keywordHalf metallic ferromagnetpt_BR
dc.subject.keywordPoint contact Andreev reflectionpt_BR
dc.identifier.source000360025800014pt_BR
dc.creator.orcidSem informaçãopt_BR
dc.type.formArtigopt_BR
dc.description.sponsorNoteOne of the authors, LB would like to thank UGC, Government of India for providing the senior research fellowship. AIM acknowledges the support from TAP fellowship under SEED Grant (Project code 13IRCCSG020). KGS thanks ISRO, Govt. of India for the funds for carrying out this work. Authors thank D. Buddhikot, TIFR for his help in magneto-transport measurements.pt_BR
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