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000205651 1001_ $$0P:(DE-H253)PIP1013983$$aKasiuk, Julia$$b0$$eCorresponding Author
000205651 245__ $$aGrowth-Induced Non-Planar Magnetic Anisotropy in $\mathrm{FeCoZr-CaF_{2}}$ Nanogranular Films: Structural and Magnetic Characterization
000205651 260__ $$aMelville, NY$$bAmerican Inst. of Physics$$c2014
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000205651 520__ $$aThe relation between nanoscale structure, local atomic order and magnetic properties of $(FeCoZr)_{x}(CaF_{2})_{100−x} (29 ≤ x ≤ 73 at. %)$ granular films is studied as a function of metal/insulator fraction ratio. The films of a thickness of 1–6 μm were deposited on Al-foils and glass-ceramic substrates, by ion sputtering of targets of different metal/insulator contents. Structural characterization with X-ray and electron diffraction as well as transmission electron microscopy revealed that the films are composed of isolated nanocrystalline bcc $\alpha-FeCo(Zr)$ alloy and insulating fcc $CaF_{2}$ matrix. They grow in a columnar structure, where elongated metallic nanograins are arranged on top of each other within the columns almost normal to the substrate surface. Mössbauer spectroscopy and magnetometry results indicate that their easy magnetization axes are oriented at an angle of 65°–74° to the surface in films with x between 46 and 74, above the electrical percolation threshold, which is attributed to the growth-induced shape anisotropy. Interatomic distances characteristic for metallic state of $\alpha-FeCo(Zr)$ nanograins were revealed by X-ray Absorption Spectroscopy. The results show a lack of surface oxidation of the alloy nanograins, so the growth-induced orientation of nanograins in the films cannot be attributed to this effect. The study is among the first to report a growth-induced non-planar magnetic anisotropy in metal/insulator granular films above the percolation threshold and to reveal the origin of it.
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000205651 536__ $$0G:(EU-Grant)226716$$aELISA - European Light Sources Activities - Synchrotrons and Free Electron Lasers (226716)$$c226716$$fFP7-INFRASTRUCTURES-2008-1$$x2
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000205651 7001_ $$0P:(DE-H253)PIP1013977$$aFedotova, Julia$$b1
000205651 7001_ $$0P:(DE-H253)PIP1010866$$aPrzewoznik, J.$$b2
000205651 7001_ $$0P:(DE-HGF)0$$aZukrowski, J.$$b3
000205651 7001_ $$0P:(DE-H253)PIP1008924$$aSikora, M.$$b4
000205651 7001_ $$0P:(DE-H253)PIP1010040$$aKapusta, Cz.$$b5
000205651 7001_ $$0P:(DE-HGF)0$$aGrce, A.$$b6
000205651 7001_ $$0P:(DE-HGF)0$$aMilosavljević, M.$$b7
000205651 773__ $$0PERI:(DE-600)1476463-5$$a10.1063/1.4891016$$gVol. 116, no. 4, p. 044301 -$$n4$$p044301 $$tJournal of applied physics$$v116$$x1089-7550$$y2014
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