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Physical properties of ion - beam mixed Fe / Si multilayered films
J. S. Park,C. O. Kim,Y. P. Lee,Y. V. Kudryavtsev,J. Dubowik,B. Szymanski,J. Y. Rhee 한국진공학회(ASCT) 2001 Journal of Korean Vacuum Science & Technology Vol.5 No.2
We investigated physical properties of ion-beam mixed Fe/Si multilayerd films(MLF) prepared by rf sputtering onto glass substrates at room temperature. Such an ion-beam treatment has led to noticeable changes in the structural and physical properties of the MLF; the formation of a new phase which is characterized by a crystalline silicide with a low coercivity and Tc ~~ 550 K. In contrast to the as-prepared state, the ion-beam mixed MLF contains two magnetic phases. One of them is a very soft (Hc < 2 Oe), but microscopically homogeneous one with M_(eff)= 6.7 kG.
J. Dubowik,Y. V. Kudryavtsev,Y. P. Lee 한국자기학회 2004 Journal of Magnetics Vol.9 No.2
Polycrystalline Ni-Mn-Ga films have been deposited onto mica substrates held at 720 K by flash-evaporation method. At room temperature the films have a tetragonal structure with a = b = 0.598 and c = 0.576 ㎚ typical for bulk Ni₂MnGa below a martensitic transformation. Temperature measurements of ferromagnetic resonance reveal a martensitic phase transformation at 310 K. The transformation brings about a substantial decrease in the effective magnetization and a drastic increase in the ferromagnetic resonance linewidth due to a strong increase in the magnetic anisotropy in the martensitic phase.
Magnetic properties of Ni-Mn-Ga Heusler alloy films
Dubowik, J.,Goś,ciań,ska, I.,Kudryavtsev, Y. V.,Lee, Y. P.,Sová,k, P.,Konĉ,, M. WILEY-VCH Verlag 2006 Physica Status Solidi C Vol.3 No.1
<P>The films with composition Ni<SUB>x </SUB>Mn<SUB>y </SUB>Ga<SUB>z </SUB> (x = 50 ± 5, y = 25 ± 5, z = 25 ± 5) were deposited by flash-evaporation or sputtering on mica and glass substrates and annealed in a high vacuum at 673–973 K. X-ray diffraction at room temperature reveals the presence of B2 (or L2<SUB>1</SUB>) type of structure depending on annealing conditions. Magnetic properties were studied by ferromagnetic resonance at temperatures from 78 K to 400 K and compared with electric resistivity data. It is shown that the magnetic properties of the films critically depend on their structural ordering and microstructure. The films annealed at T < 800 K reveal a complex magnetic behavior due to their specific microstructure while those annealed at T > 800 K show magnetic properties comparable with those of bulk Ni-Mn-Ga alloys. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Ferromagnetic Resonance Studies of Ultrathin Co Layers in Co / Ag Multilayers
J. Dubowik 한국자기학회 1999 Journal of Magnetics Vol.4 No.3
A relationship between microstructure and ferromagnetic resonance of Co/Ag multilayers has been studied in as-deposited and annealed multilayers with ultrathin (d_(Co) < 1 ㎚) Co layers. Depending on the nominal thickness of Co Co/Ag multilayers represent a system of fine magnetic particles (d_(Co) < 0.4 ㎚) or discontinuous layered structure (d_(Co)/0.5 ㎚). FMR data has been interpreted in the framework of a model of interacting fine particles exhibiting superparamagnetic behavior. Changes in the FMR spectra upon annealing have been attributed to the growth of the Co particles and to a transition from the fcc to hcp atomic structure of the highly (111) textured Co particles.