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- W2757289315 abstract "The magnetization of thin films of cobalt ferrite frequently falls far below the bulk value of $455phantom{rule{0.16em}{0ex}}mathrm{kA}{mathrm{m}}^{ensuremath{-}1}$, which corresponds to an inverse cation distribution in the spinel structure with a significant orbital moment of about $0.6phantom{rule{0.16em}{0ex}}{ensuremath{mu}}_{mathrm{B}}$ that is associated with the octahedrally coordinated $mathrm{C}{mathrm{o}}^{2+}$ ions. The orbital moment is responsible for the magnetostriction and magnetocrystalline anisotropy and its sensitivity to imposed strain. We have systematically investigated the structure and magnetism of films produced by pulsed-laser deposition on different substrates ($mathrm{Ti}{mathrm{O}}_{2}$, MgO, $mathrm{MgA}{mathrm{l}}_{2}{mathrm{O}}_{4}$, $mathrm{SrTi}{mathrm{O}}_{3}$, LSAT, $mathrm{LaAl}{mathrm{O}}_{3}$) and as a function of temperature $(500ensuremath{-}700{phantom{rule{0.16em}{0ex}}}^{ensuremath{circ}}mathrm{C})$ and oxygen pressure $({10}^{ensuremath{-}4}ensuremath{-}10phantom{rule{0.16em}{0ex}}mathrm{Pa})$. Magnetization at room-temperature ranges from 60 to $440phantom{rule{0.16em}{0ex}}mathrm{kA}{mathrm{m}}^{ensuremath{-}1}$, and uniaxial substrate-induced anisotropy ranges from $+220phantom{rule{0.16em}{0ex}}mathrm{kJ}{mathrm{m}}^{ensuremath{-}3}$ for films on deposited on MgO (100) to $ensuremath{-}2100phantom{rule{0.16em}{0ex}}mathrm{kJ}{mathrm{m}}^{ensuremath{-}3}$ for films deposited on $mathrm{MgA}{mathrm{l}}_{2}{mathrm{O}}_{4}$ (100), where the room-temperature anisotropy field reaches 14 T. No rearrangement of high-spin $mathrm{F}{mathrm{e}}^{3+}$ and $mathrm{C}{mathrm{o}}^{2+}$ cations on tetrahedral and octahedral sites can reduce the magnetization below the bulk value, but a switch from $mathrm{F}{mathrm{e}}^{3+}$ and $mathrm{C}{mathrm{o}}^{2+}$ to $mathrm{F}{mathrm{e}}^{2+}$ and low-spin $mathrm{C}{mathrm{o}}^{3+}$ on octahedral sites will reduce the low-temperature magnetization to $120phantom{rule{0.16em}{0ex}}mathrm{kA}{mathrm{m}}^{ensuremath{-}1}$, and a consequent reduction of Curie temperature can bring the room-temperature value to near zero. Possible reasons for the appearance of low-spin cobalt in the thin films are discussed." @default.
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- W2757289315 date "2017-12-29" @default.
- W2757289315 modified "2023-10-09" @default.
- W2757289315 title "Magnetization and anisotropy of cobalt ferrite thin films" @default.
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- W2757289315 doi "https://doi.org/10.1103/physrevmaterials.1.074413" @default.
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