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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Misaligned anisotropies in spin-valve films studied through magnetoresistance and magnetization measurements

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Limeira, V. P. C. [1] ; Nagamine, L. C. C. M. [1] ; Geshev, J. [2] ; Cornejo, D. R. [1] ; Garanhani, F. J. [1]
Total Authors: 5
[1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, SP - Brazil
[2] URFGS, Inst Fis, BR-91501970 Porto Alegre, RS - Brazil
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 0

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)

FAPESP's process: 16/21371-5 - Structural, magnetic and hyperfine properties of nanoparticles of ferrites (MxFe3-xO4, M=Co, Ni, Cu or Zn) and In-Sn-O (ITO) doped with transition metals and rare-earth elements: Potential applications in hyperthermia and gas sensors
Grantee:Luiz Carlos Camargo Miranda Nagamine
Support type: Regular Research Grants