Probing the morphology of epitaxial Fe/MgO discontinuous multilayers by magnetometric technique

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:474

Article

Vovk, A.^1,2  Garcia-Garcia, A.^1,2,3  Pogorelov, Y. G.^1,2  Pardo, J. A.^4,5  Strichovanec, P.⁶  Magen, C.^6,7  Algaraber, P. A.^6,7  Araujo, J. P.^1,2  Kakazei, G. N.^1,2 

[1] Univ Porto, IFIMUP, Dept Fis & Astron, P-4169007 Porto, Portugal

[2] Univ Porto, IN Inst Nanosci & Nanotechnol, P-4169007 Porto, Portugal

[3] Ed CEMINEM, Graphene & Nanotechnol, Zaragoza 50018, Spain

[4] Univ Zaragoza, Dept Ciencia & Tecnol Mat & Fluidos, Zaragoza 50018, Spain

[5] Univ Zaragoza, Inst Nanociencia Aragon, Zaragoza 50018, Spain

[6] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain

[7] Univ Zaragoza, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain

关键词: Discontinuous metal-insulator multilayers;    Superparamagnetic nanoparticles;    Magnetic isotherms;    Tunneling magnetoresistance;   

DOI  :  10.1016/j.jmmm.2018.11.015

来源: Elsevier

【 摘 要 】

Discontinuous metal-insulator multilayers (DMIMs) are a special type of nanostructures with a layered arrangement of metallic particles sandwiched between continuous insulating layers. DMIMs exhibit moderate tunneling magnetoresistance (TMR) ratio but enhanced low-field sensitivity, which makes them promising candidates for magnetic field sensors. Recently we have grown epitaxial Fe/MgO DMIMs on MgO (0 0 1) single crystal substrates at different deposition conditions. Here, based on the analysis of magnetic isotherms in a broad temperature range, the effect of deposition temperature (T-S) on microstructure of DMIMs is being studied and compared with the results of Transmission Electron Microscopy. It is shown that metallic layers consist of flat nanoparticles whose average size decreases, and their crystallinity improves with the increase of T-S.

【 授权许可】

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