AVS 60th International Symposium and Exhibition
    Thin Film Wednesday Sessions
       Session TF+MI-WeM

Paper TF+MI-WeM4
Mössbauer Study of Disordering in Thin Sputtered FeCo–SiO2 and FeCo Films

Wednesday, October 30, 2013, 9:00 am, Room 102 C

Session: Magnetic Thin Films and Nanostructures
Presenter: S.S. Maklakov, Institute for Theoretical and Applied Electromagnetics, Russian Federation
Authors: S.S. Maklakov, Institute for Theoretical and Applied Electromagnetics, Russian Federation
S.A. Maklakov, Institute for Theoretical and Applied Electromagnetics, Russian Federation
I.A. Ryzhikov, Institute for Theoretical and Applied Electromagnetics, Russian Federation
V.A. Amelichev, M.V. Lomonosov Moscow State University, Russian Federation
K.V. Pokholok, M.V. Lomonosov Moscow State University, Russian Federation
K.N. Rozanov, Institute for Theoretical and Applied Electromagnetics, Russian Federation
A.V. Osipov, Institute for Theoretical and Applied Electromagnetics, Russian Federation
A.N. Lagarkov, Institute for Theoretical and Applied Electromagnetics, Russian Federation
Correspondent: Click to Email
Thin ferromagnetic films possess perspective applications for a data recording devices, magnetic field sensors, and microwave devices[1]. Thin nanocomposite films, which are prepared of a dielectric matrix and ferromagnetic filler, show interesting magnetic properties. In the case, magnetic properties are determined by exchange interactions and dipole-dipole interactions between ferromagnetic nanoparticles. Among the other techniques, magnetron sputtering results in the composite films with high uniformity. The report demonstrates structural modification in a solid solution Fe70Co30 which is caused by additional energy flux towards the substrate during a (Fe70Co30)95(SiO2)5 composite growth comparing with the metal film growth.

Thin metal films (h = 130 nm) were deposited via DC magnetron sputtering onto a PET substrate; the DC magnetron operating regime (time, pressure and discharge parameters) was identical during the composite synthesis. To sputter SiO2, a RF magnetron was applied; both magnetrons were sputtering simultaneously. To derive structure information, a Mossbauer spectroscopy, X-ray diffraction (GIXD) and electron microscopy data were gathered. Magnetic properties were studied using VSM and a coaxial line technique for a microwave permeability.

Thin Fe70Cо30 and (Fe70Co30)95(SiO2)5 films show differently broadened Mossbauer sextet. Composite film possess unusually high effective field at iron nuclei He = 371(3) kOe. We propose a model which describes He values depending on environment of a reference iron atom[2]. With this construction, Fe70Co30 solid solution possesses higher CsCl-type ordering degree when in form of the composite. Such modification is the result of surface processes during film growth. SiO2 injection also decreases FMR frequency from 10 to 3 GHz, depending on a composition.

The results reported may be applied to design thin film microwave devices.

Literature

1. S.S. Maklakov, S.A. Maklakov, I.A. Ryzhikov, K.N. Rozanov, A.V. Osipov. Thin Co films with tunable ferromagnetic resonance frequency. // J. Magn. Magn. Mater. 324 (2012) 2108-2112

2. S.S. Maklakov, S.A. Maklakov, I.A. Ryzhikov, V.A. Amelichev, K.V. Pokholok , A.N. Lagarkov. Mossbauer study of disordering in thin sputtered FeCo–SiO2 and FeCo films. // J. Alloys. Compd. 536 (2012) 33-37