Stress-induced magnetic anisotropy of CoFe2O4 thin films using pulsed laser deposition

The magnetization of epitaxial nanometric CoFe2O4(001) layers

“…Inspection of these data clearly indicates that the inplane direction is easier than the out-of-plane one, in agreement with previous results of CFO on STO. [8][9][10] The in-plane biaxial anisotropy results from a compressive in-plane strain epitaxially induced by the STO substrate ͑see below͒ and a negative magnetostriction constant. The magnetization loops, measured with H applied in plane at different angles with respect to the ͓100͔ direction, do not display significant anisotropy ͓Fig.…”

“…As a result of this subtle energy competition, it has been found that epitaxial CFO films display an easy-magnetization plane when grown in-plane compressively strained, as in the case of CFO on SrTiO 3 ͑STO͒, [7][8][9] whereas an easy-axis direction perpendicular to the plane is favored when grown under in-plane tensile strain. [10][11][12][13] These results are both compatible with the reported negative magnetostriction constant ͓100͔ Ͻ 0.…”

“…For instance, the recent observation of a spin reorientation from out-of-plane to in-plane type of anisotropy that takes place when increasing the thickness of CFO films grown on MgO has been interpreted as due to the dominating role of lattice strain. 13 Other than this, quite often the hysteresis loops of CFO thin films display an unexpected shrinking at low fields, [8][9][10]14 which although being of relevance for any practical application of CFO-based devices, has remained unexplained.…”

Simultaneous enhancements of polarization and magnetization in epitaxialPb(Zr0.52Ti0.48)O3/Mukherjee1, Hordagoda2, Lampen3 et al. 2015Phys. Rev. B29390View full textAdd to dashboardCite

“…In-plane (a ‫װ‬ ) and out-of-plane (a ⊥ ) lattice parameters were calculated for the individual layers in the P/C(0-50nm)/L heterostructures using XRD asymmetric (2θ-ω) scans and = -590 x 10 -6 is the magnetostriction coefficient for CFO [35]) are also given in Table I. It is clear that P/C(10nm)/L exhibits the highest tetragonal distortion due to in-plane compressive and out-of-plane tensile strains which result in its higher magneto-elastic stress anisotropy as compared to P/C(20nm)/L and P/C(50nm)/L.…”

Structural Phase Transition, Electronic Structure, and Magnetic Properties of Sol-gel-prepared Inverse-spinel Nickel-ferrites Thin Films

“…The observed reduction in the strength of the peak A of the x = 0.96 sample, compared to that of the Fe 3 O 4 sample, implies the formation of vacancies in the tetrahedral oxygen sites. The exposure of the film's surface to air in the spin-coating steps, and to vacuum during post-annealing, is likely to promote oxygen vacancies, due to oxygen out-diffusion from the surface [15]. …”