Influence of miscut direction on magnetic anisotropy of magnetite films grown on vicinal MgO (100)

Abstract

Ferromagnetic resonance ͑FMR͒ was used to study the influence of miscut direction on the in-plane fourfold and uniaxial magnetic anisotropies of epitaxial Fe 3 O 4 films grown on vicinal MgO ͑100͒ surfaces. In-plane angular dependent measurements at room temperature on Fe 3 O 4 films on two different miscut directions ͑miscut along ͗011͘ and ͗010͘ directions͒ of MgO showed the presence of both in-plane fourfold ͑cubic͒ and in-plane uniaxial anisotropies. Temperature dependent FMR investigations show that the in-plane fourfold anisotropy constant ͑K 4 ͒ is approximately the same for both samples at room temperature. The magnitude of K 4 increases gradually with decreasing temperature and changes sign from negative to positive values at 130 K. This behavior is consistent with that of bulk magnetite. In addition to K 4 , we find an additional uniaxial component ͑K 2 ͒, whose strength is quite different for the different miscut directions. The magnitude of K 2 shows very little or no temperature dependence. The observed differences in the magnitude of K 2 with miscut directions are related to the changes in the antiphase boundary structure and altered magnetic configurations at the boundaries.

Magnetic and resonance properties of Fe nanowire arrays on oxidised step-bunched silicon templates

“…Based on the parameters extracted from FMR spectra, one can make conclusions about magnetic anisotropy, magnetic phase composition, degree of inhomogeneity etc. [17,18]. In this report, we present a systematic analysis of the magnetic behaviour of the planar NW arrays of Fe and show that the magnetisation reversal is described by coherent-rotation model of localized character.…”

Induced morphological changes on vicinal MgO (100) subjected to high-temperature annealing: step formation and surface stability

“…Additionally, stepped surfaces are often used as substrates, in particular as templates for producing ordered nanoparticle arrangements, nanostructures, and nanowires . The presence of steps arrays can influence the magnetic, electronic, and transport properties of films grown on top . Magnetic properties of epitaxial thin films grown on vicinal MgO surfaces attract much attention both from the fundamental and applied points of view .…”

“…The presence of steps arrays can influence the magnetic, electronic, and transport properties of films grown on top . Magnetic properties of epitaxial thin films grown on vicinal MgO surfaces attract much attention both from the fundamental and applied points of view . For example, the magnetic anisotropy of an Fe 3 O 4 film is affected by the presence of regular atomic step‐edge arrays.…”