Abstract
The epitaxial 200-nm-thick FeV2O4(110) films on (110)-oriented SrTiO3, LaAlO3 and MgAl2O4 substrates were fabricated for the first time by pulsed laser deposition, and the structural, magnetic, and magnetoresistance anisotropy were investigated systematically. All the films are monoclinic, whereas its bulk is cubic. Compared to FeV2O4 single crystals, films on SrTiO3 and MgAl2O4 are strongly compressively strained in [001] direction, while slightly tensily strained along normal [110] and in-plane [11¯0] directions. In contrast, films on LaAlO3 are only slightly distorted from cubic. The magnetic hard axis is in <001> direction, while the easier axis is along normal [110] direction for films on SrTiO3 and MgAl2O4, and in-plane [11¯0] direction for films on LaAlO3. Magnetoresistance anisotropy follows the magnetization. The magnetic anisotropy is dominated by the magnetocrystalline energy, and tuned by the magneto-elastic coupling.
Highlights
In normaloxide spinel FeV2O4 (FVO), both Fe2+ ions on the tetragonal A-sites and V3+ ions on octahedral B-sites are magnetic and have orbital degrees of freedom
The epitaxial 200-nm-thick FeV2O4(110) films on (110)-oriented SrTiO3, LaAlO3 and MgAl2O4 substrates were fabricated for the first time by pulsed laser deposition, and the structural, magnetic, and magnetoresistance anisotropy were investigated systematically
The magnetic hard axis is in direction, while the easier axis is along normal [110] direction for films on SrTiO3 and MgAl2O4, and in-plane [110] direction for films on LaAlO3
Summary
In normaloxide spinel FeV2O4 (FVO), both Fe2+ ions on the tetragonal A-sites and V3+ ions on octahedral B-sites are magnetic and have orbital degrees of freedom. Three successive structural phase transitions in stoichiometric FVO were reported: from cubic to high temperature tetragonal (c < a) at TS=140 K, from high temperature tetragonal (c < a) to orthorhombic at TN1=110 K, and from orthorhombic to low temperature tetragonal (c > a) at TN2=70 K The latter two are accompanied by two magnetic phase transitions, indicating the strong coupling between the magnetism and lattice. We prepared FVO (001) thin films on (001)-orientated STO, LAO, and MAO substrates, and biaxial strain was observed in the film plane. The magnetic easy axis of all the films is normal to the film plane, independent of substrates, film thickness and strain states, which is attributed to the high tetragonality with c>a due to the strong spin-lattice coupling.Until to no investigations on the (110)-orientated FVO films were reported. The structural, magnetic and magnetoresistance anisotropy of the as-prepared thin films was systematically investigated
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