Positive antiphase boundary domain wall magnetoresistance in Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(110) heteroepitaxial films

Sofin, R. G. S.; Arora, S. K.; Shvets, I. V.

doi:10.1103/physrevb.83.134436

Cited by 70 publications

(52 citation statements)

References 44 publications

(78 reference statements)

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“…Characteristic steps are observed in the hysteresis loops around zero field. These step-like features are commonly found in CFO thin films [54,60] and other ferrimagnetic oxides such as Fe 3 O 4 [57] or -Fe 2 O 3 [61], and have been attributed to the result of coupled antiferromagnetic domains due to the presence of APBs by Sofin et al [62]. A larger density of APBs would lead to a larger step at zero field.…”

Section: Iiic Comparison Between Vsm and Smr Measurementsmentioning

confidence: 77%

“…Elastic energy shall be released during film growth and the simplest way is to reduce the APBs density away from the interface with the substrate. Within the scope of APBs model developed by Sofin et al [62], the observed difference between bulk and surface magnetization (green line in Fig. 5b) would reflect the magnetization reversal of domains antiferromagnetically coupled across APBs.…”

Section: Figure 5 (A) Magnetic Hysteresis Loops For the Pt(2 Nm)/cfomentioning

confidence: 85%

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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%

Section: Figure 5 (A) Magnetic Hysteresis Loops For the Pt(2 Nm)/cfomentioning

confidence: 85%

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

et al. 2016

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“…The longer steps terminate at surface Fe tet atoms (grey), while the shorter steps terminate at the Fe oct atoms (red). (110) surface has been less studied than the (111) and (100) surfaces, both experimentally [306][307][308] and computationally [309][310][311]. In principle, there are two possibilities to truncate the bulk at the (110) [228].…”

Section: 44mentioning

confidence: 99%

Iron oxide surfaces

Parkinson

2016

Surface Science Reports

487

463

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The current status of knowledge regarding the surfaces of the iron oxides, magnetite (Fe 3 O 4 ), maghemite (γ-Fe 2 O 3 ), hematite (α-Fe 2 O 3 ), and wüstite (Fe 1-x O) is reviewed. The paper starts with a summary of applications where iron oxide surfaces play a major role, including corrosion, catalysis, spintronics, magnetic nanoparticles (MNPs), biomedicine, photoelectrochemical water splitting and groundwater remediation. The bulk structure and properties are then briefly presented; each compound is based on a close-packed anion lattice, with a different distribution and oxidation state of the Fe cations in interstitial sites. The bulk defect chemistry is dominated by cation vacancies and interstitials (not oxygen vacancies) and this provides the context to understand iron oxide surfaces, which represent the front line in reduction and oxidation processes. The atomic-scale structure of the low-index surfaces of iron oxides is the major focus of this review. Fe 3 O 4 is the most studied iron oxide in surface science, primarily because its stability range corresponds nicely to the ultra-high vacuum environment, and because it is an electrical conductor, which makes it straightforward to study with the most commonly used surface science methods such as photoemission spectroscopies (XPS, UPS) and scanning tunneling microscopy (STM). The impact of the surfaces on the measurement of bulk properties such as magnetism, the Verwey transition and the (predicted) half-metallicity is discussed.The best understood iron oxide surface at present is probably Fe 3 O 4 (100); the structure is known with a high degree of precision and the major defects and properties are well characterised. A major factor in this is that a termination at the Fe oct -O plane can be reproducibly prepared by a variety of methods, as long as the surface is annealed in 10 Such straightforward preparation of a monophase termination is generally not the case for other iron oxide surfaces. All available evidence suggests the oft-studied (√2×√2)R45° reconstruction results from a rearrangement of the cation lattice in the outermost unit cell in which two octahedral cations are replaced by one tetrahedral interstitial, a motif conceptually similar to well-known Koch-Cohen defects in Fe (0001) is the most studied hematite surface, but 2 difficulties preparing stoichiometric surfaces under UHV conditions have hampered a definitive determination of the structure. There is evidence for at least three terminations: a bulk-like termination at the oxygen plane, a termination with half of the cation layer, and a termination with ferryl groups. When the surface is reduced the so-called "bi-phase" structure is formed, which eventually transforms to a Fe 3 O 4 (111)-like termination. The structure of the bi-phase surface is controversial; a largely accepted model of coexisting Fe 1-x O and α-Fe 2 O 3 (0001) islands was recently challenged and a new structure based on a thin film of Fe 3 O 4 (111) on α-Fe 2 O 3 (0001) was proposed. The merits of the compet...

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“…This value is much lower than values reported for Fe 3 O 4 thin films grown on (001)-oriented MgO or Al 2 O 3 substrates. 70,71 This might be explained by the disordered growth within the initial phase of the deposition process, leading to a disconnection of the Fe 3 O 4 thin film with the surface structure of the BTO substrate. Thus, the deviation in saturation magnetization ∆M s might not be explained by APBs alone.…”

mentioning

confidence: 99%

Converse magnetoelectric effects in Fe3O4/BaTiO3multiferroic hybrids

et al. 2013

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The quantitative understanding of converse magnetoelectric effects, i.e., the variation of the magnetization as a function of an applied electric field, in extrinsic multiferroic hybrids is a key prerequisite for the development of future spintronic devices. We present a detailed study of the strain-mediated converse magnetoelectric effect in ferrimagnetic Fe3O4 thin films on ferroelectric BaTiO3 substrates at room temperature. The experimental results are in excellent agreement with numerical simulation based on a two-region model. This demonstrates that the electric field induced changes of the magnetic state in the Fe3O4 thin film can be well described by the presence of two different ferroelastic domains in the BaTiO3 substrate, resulting in two differently strained regions in the Fe3O4 film with different magnetic properties. The two-region model allows to predict the converse magnetoelectric effects in multiferroic hybrid structures consisting of ferromagnetic thin films on ferroelastic substrates.

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Positive antiphase boundary domain wall magnetoresistance in Fe3O4(110) heteroepitaxial films

Cited by 70 publications

References 44 publications

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

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

Iron oxide surfaces

Converse magnetoelectric effects in Fe3O4/BaTiO3multiferroic hybrids

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