Growth of crystalline cobalt ferrite thin films at lower temperatures using pulsed-laser deposition technique

Abstract

Threading dislocation-governed degradation in crystal quality of heteroepitaxial materials: The case of InAlN nearly lattice-matched to GaN J. Appl. Phys. 111, 053535 (2012) Ferroelectric domain structures of 0.4-μm-thick Pb(Zr,Ti)O3 films prepared by polyvinylpyrrolidone-assisted SolGel method J. Appl. Phys. 111, 054109 (2012) Columnar grain growth of FePt (L10) Cobalt ferrite thin films were grown on SiO 2 / Si͑100͒ substrates using pulsed-laser deposition technique at substrate temperatures ranging from 250 to 600°C. Thermal expansion mismatch between the film and substrate appears to have a substantial effect on the magnetic properties of the cobalt ferrite films, due to the large magnetoelastic coupling of cobalt ferrite. It was shown in this study, that polycrystalline films with ͑111͒-preferred orientation could be prepared at substrate temperatures as low as 250°C. The growth of crystalline cobalt ferrite films at such low temperatures indicates the potential to use cobalt ferrite for microelectromechanical systems devices and sensor applications including integration with a wider range of multilayer device structures.

Temperature dependence of magnetic properties of heat treated cobalt ferrite

“…Consequently, higher heat treatment temperature results in regime 3 starting at a lower temperature. Figure 6 shows that the Curie temperature of all the heat treated and air-cooled samples are comparable with values $763 K. Air cooled cobalt ferrite can have Curie temperature in the range 713 K to 793 K 7,15,20,21 ). The quenching heat treatment on these samples did not result in observable changes in Curie temperature.…”

Perpendicular magnetic anisotropy in 70nm CoFe2O4 thin films fabricated on SiO2/Si(100) by the sol–gel method

“…The tailoring of magnetic anisotropy in CFO films can be achieved by tuning the stress state of the CFO films using different substrates, inserting a buffer layer as well as varying film thickness [17][18][19][20]23,26]. For example, in-plane alignment of the easy axis is * Corresponding author.…”

“…[1][2][3][4][5][6][7][8]. The modification of magnetic and dielectric properties of CFO can be realized through substitution [9][10][11], fabrication of monodispersed purified hollow ferrite spheres [12] and growth of CFO films on different substrates using various techniques such as sputtering, molecular beam epitaxy, pulsed laser deposition and sol-gel method [3,4,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Considering practical applications in magnetic recording, the sol-gel method is an attractive alternative to other deposition methods due to its advantages such as lower annealing temperature, easier composition control, non-vacuum process and easier fabrication of large area thin films [21,23].…”

Magnetic and optical properties of MgAl2O4-(Ni0.5Zn0.5)Fe2O4thin films prepared by pulsed laser deposition

“…The magneto-optical properties of ferrites have been attracting considerable attention because of their possible application to magneto-optical recording [1][2][3][4], optical isolators [5,6] and optical circulators [7]. Yttrium iron garnet (YIG) is used for Faraday rotation devices in the wavelength range of 1.3-1.5 µm because this material exhibits high transparency in the range of 1-8 µm [8] and a large Faraday rotation angle [9].…”