| Texto completo | |
| Autor(es): |
Limeira, V. P. C.
[1]
;
Nagamine, L. C. C. M.
[1]
;
Geshev, J.
[2]
;
Cornejo, D. R.
[1]
;
Garanhani, F. J.
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, SP - Brazil
[2] URFGS, Inst Fis, BR-91501970 Porto Alegre, RS - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF PHYSICS-CONDENSED MATTER; v. 31, n. 26 JUL 3 2019. |
| Citações Web of Science: | 0 |
| Resumo | |
Magnetization and magnetoresistance properties of Py/Cu/Py/IrMn spin valve (SV) films are studied in the framework of the modified antiferromagnetic domain-wall model applied to a granular multidomain system. In the simulations, a misalignment between the in-plane easy magnetization axes of the Py and IrMn is considered. Magnetization and magnetoresistance data are simulated for a number of field orientations and a fairly good agreement with the experiment is found. The same holds for the respective distributions of the coercive and exchange-bias field values determined from magnetoresistance first-order reversal curves (MR-FORC) obtained for magnetic field parallel to the direction of that applied during the sample deposition. Both experimental and theoretical data of the angular variations of the magnetoresistance at constant fields are successfully used to obtain the misalignment angles. For some samples, mostly those with thinner Py layer coupled to IrMn one, our results indicate that the misalignment is due to interfacial magnetic frustration. Moreover, it is shown that MR-FORC diagrams are useful to extract information about the alignment of the grains along the field-cooling directions in SVs, as well as that these can be used to determine the threshold of the continuity of the pinned magnetic layer. (AU) | |
| Processo FAPESP: | 16/21371-5 - Propriedades estruturais, magnéticas e hiperfinas de nanopartículas de ferritas (MxFe3-xO4, M=Co, Ni, Cu ou Zn) e de In-Sn-O (ITO) dopadas com metais de transição e terras-raras: Potenciais aplicações em hipertermia e em sensores de gás |
| Beneficiário: | Luiz Carlos Camargo Miranda Nagamine |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |