The origin of the anomalous magnetic behavior in single crystal Fe/sub 3/O/sub 4/ films

Margulies, D. T.; Parker, F. T.; Rudee, M. L.; Spada, F. E.; Chapman, J. N.; Aitchison, P. R.; Berkowitz, A. E.

doi:10.1109/intmag.1998.742121

Cited by 33 publications

(65 citation statements)

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“…The shape of the hysteresis loop when the field is applied out of plane, M(H||n), indicates a harder magnetization axis and, correspondingly, the coercive field  0 H c (n) ≈ ±0.44 T and the magnetic remanence are smaller. The saturation magnetization (M s =230 emu/cm 3 ) is lower than the corresponding bulk value as commonly observed in spinel thin films [56][57][58][59] and attributed to the presence of antiphase boundaries (APB) [56,57] or to surface anisotropy effects [39]. Characteristic steps are observed in the hysteresis loops around zero field.…”

Section: Iiic Comparison Between Vsm and Smr Measurementsmentioning

confidence: 77%

Spin Hall Magnetoresistance as a Probe for Surface Magnetization inPt/CoFe2O4Bilayers

et al. 2016

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We study the spin Hall magnetoresistance (SMR) in Pt grown in situ on CoFe 2 O 4 (CFO) ferrimagnetic insulating (FMI) films. A careful analysis of the angle-dependent and fielddependent longitudinal magnetoresistance indicates that the SMR contains a contribution that does not follow the bulk magnetization of CFO but it is a fingerprint of the complex magnetism at the surface of the CFO layer, thus signaling SMR as a tool for mapping surface magnetization. A systematic study of the SMR for different temperatures and CFO thicknesses gives us information impossible to obtain with any standard magnetometry technique. On one hand, surface magnetization behaves independently of the CFO thickness and does not saturate up to high fields, evidencing that the surface has its own anisotropy. On the other hand, characteristic zero-field magnetization steps are not present at the surface while they are relevant in the bulk, strongly suggesting that antiphase boundaries are the responsible of such intriguing features. In addition, a contribution from ordinary magnetoresistance of Pt is identified, which is only distinguishable due to the low resistivity of the in-situ grown Pt.

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Section: Iiic Comparison Between Vsm and Smr Measurementsmentioning

confidence: 77%

Spin Hall Magnetoresistance as a Probe for Surface Magnetization inPt/CoFe2O4Bilayers

et al. 2016

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“…Magnetite, Fe O , is an important half metallic oxide due to its high Curie temperature of 858 K and the presence of a metal-insulator transition at 120 K [3]. Various thin film growth techniques have been employed to grow epitaxial films of Fe O on suitable substrates [4]- [8]. Transport and magnetic properties of epitaxial magnetite films have been investigated in detail [4]- [8].…”

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confidence: 99%

“…Various thin film growth techniques have been employed to grow epitaxial films of Fe O on suitable substrates [4]- [8]. Transport and magnetic properties of epitaxial magnetite films have been investigated in detail [4]- [8].…”

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confidence: 99%

Magnetic Properties of Ultrathin Magnetite Films Grown by Molecular Beam Epitaxy

Arora

Yao

et al. 2008

IEEE Trans. Magn.

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Magnetic properties as a function of film thickness (2-55 nm) for magnetite (Fe 3 O 4 ) thin films grown on MgO (100) substrates show that the small thickness films ( 5 nm) are ferromagnetic and possess magnetization values which are much greater than that of bulk Fe 3 O 4 . The inverse thickness dependence of the magnetization points to an interface related mechanism. Whereas, our detailed spin polarized density functional theoretical calculations suggests that there is only a marginal enhancement in the local spin moments of Fe-atom in the vicinity of the Fe 3 O 4 -MgO interface and it turns out that the noncompensation of spin moments between the two magnetic sublattices of spinel Fe 3 O 4 is a major factor contributing to the enhancement of magnetization.

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“…Epitaxially grown Fe 3 O 4 nanofilms have been extensively investigated and have been reported to contain a type of natural growth defect, namely, antiphase boundaries (APBs) caused by strains on the film from mismatch between the substrate and the film [4,5]. The presence of APBs leads to unusual magnetic properties of epitaxial Fe 3 O 4 films, such as nonsaturation of magnetization in high magnetic fields [6].…”

Section: Introductionmentioning

confidence: 99%

Morphology and magnetic properties of Fe3O4 nanodot arrays using template-assisted epitaxial growth

Guan¹,

Chen²,

Quan³

et al. 2016

Nano Online

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Arrays of epitaxial Fe 3 O 4 nanodots were prepared using laser molecular beam epitaxy (LMBE), with the aid of ultrathin porous anodized aluminum templates. An Fe 3 O 4 film was also prepared using LMBE. Atomic force microscopy and scanning electron microscopy images showed that the Fe 3 O 4 nanodots existed over large areas of well-ordered hexagonal arrays with dot diameters (D) of 40, 70, and 140 nm; height of approximately 20 nm; and inter-dot distances (D int ) of 67, 110, and 160 nm. The calculated nanodot density was as high as 0.18 Tb in.−2 when D = 40 nm. X-ray diffraction patterns indicated that the as-grown Fe 3 O 4 nanodots and the film had good textures of (004) orientation. Both the film and the nanodot arrays exhibited magnetic anisotropy; the anisotropy of the nanoarray weakened with decreasing dot size. The Verwey transition temperature of the film and nanodot arrays with D ≥ 70 nm was observed at around 120 K, similar to that of the Fe 3 O 4 bulk; however, no clear transition was observed from the small nanodot array with D = 40 nm. Results showed that magnetic properties could be tailored through the morphology of nanodots. Therefore, Fe 3 O 4 nanodot arrays may be applied in high-density magnetic storage and spintronic devices.

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The origin of the anomalous magnetic behavior in single crystal Fe/sub 3/O/sub 4/ films

Cited by 33 publications

References 1 publication

Spin Hall Magnetoresistance as a Probe for Surface Magnetization inPt/CoFe2O4Bilayers

Spin Hall Magnetoresistance as a Probe for Surface Magnetization inPt/CoFe2O4Bilayers

Magnetic Properties of Ultrathin Magnetite Films Grown by Molecular Beam Epitaxy

Morphology and magnetic properties of Fe3O4 nanodot arrays using template-assisted epitaxial growth

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