Exchange biasing in MBE grown Fe3O4/CoO bilayers: The antiferromagnetic layer thickness dependence

Zaag, van der Pj; Ball, A.R.; Feiner, LF Lou; Wolf, R.M.; Heijden, van der Paa Paul

doi:10.1063/1.361315

Cited by 138 publications

(88 citation statements)

References 9 publications

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“…(7) does not model any kind of a peak-like structure in the 9m 0 H e 9 vs. t AF dependence. This is, however, known from experiments, e.g., on Ni 80 Fe 20 /FeMn [8] or Fe 3 O 4 /CoO [22] bilayers as well as from Monte Carlo simulations [9]. In accordance with these findings, Eq.…”

Section: Model and Analysissupporting

confidence: 70%

Exchange bias in a generalized Meiklejohn–Bean approach

Binek¹,

Hochstrat²,

Kleemann³

2001

Journal of Magnetism and Magnetic Materials

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A generalized Meiklejohn-Bean model is considered in order to derive an analytic expression for the dependence of the exchange bias field on the layer thickness involved in ferromagnetic/antiferromagnetic heterosystems, on the orientation of the applied magnetic field with respect to the magnetic easy axes and on the quenched magnetization M AF of the antiferromagnetic pinning layer. While M AF is a well-known feature of field-cooled dilute antiferromagnets, it seems to occur quite generally also in pure AF pinning substrates. The new analytic expressions are successfully compared with recent experimental results and Monte Carlo investigations. r

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Section: Model and Analysissupporting

confidence: 70%

Exchange bias in a generalized Meiklejohn–Bean approach

Binek¹,

Hochstrat²,

Kleemann³

2001

Journal of Magnetism and Magnetic Materials

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“…Fe 3 O 4 (100) films were grown on MgO(100) substrates by MBE in oxygen [165,166]and NO 2 [167] atmospheres, several orientations of Fe 3 O 4 and α-Fe 2 O 3 films were grown on different surface planes of Al 2 O 3 and MgO substrates by oxygen-plasma-assisted MBE [168][169][170]. For studying the coupling between magnetic layers, Fe 3 O 4 /NiO [171] and Fe 3 O 4 /CoO [172] superlattices were grown by MBE.…”

Section: Preparation Of Ordered Metal-oxide Surfacesmentioning

confidence: 99%

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Weiß

Ranke

2002

Progress in Surface Science

579

610

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Metal-oxide based catalysts are used for many important synthesis reactions in the chemical industry. A better understanding of the catalyst operation can be achieved by studying elemantary reaction steps on well-defined model catalyst systems. For the dehydrogenation of ethylbenzene to styrene in the presence of steam both unpromoted and potassium promoted iron-oxide catalysts are active. Here we review the work done over unpromoted single-crystalline FeO(111), Fe 3 O 4 (111) and α-Fe 2 O 3 (0001) films grown epitaxially on Pt(111) substrates. Their geometric and electronic surface structures were characterized by STM, LEED, electron microscopy and electron spectroscopic techniques. In an integrative approach, the interaction of water, ethylbenzene and styrene with these films was investigated mainly by thermal desorption and photoelectron emission spectroscopy. The adsorptiondesorption energetics and kinetics depend on the oxide surface terminations and are correlated to the electronic structures and acid-base properties of the corresponding oxide phases, which reveal insight into the nature of the active sites and into the catalytic function of semiconducting oxides in general. Catalytic studies, using a batch reactor arrangement at high gas pressures and post reaction surface analysis, showed that only α-Fe 2 O 3 (0001) containing surface defects is catalytically active, whereas Fe 3 O 4 (111) is always inactive. This can be related to the elementary adsorption and desorption properties observed in ultrahigh vacuum, which indicates that the surface chemical properties of the iron-oxide films do not change significantly across the "pressure-gap". A model is proposed according to which the active site involves a regular acidic surface sites and a defect site next to it. The results on metal-oxide surface chemistry also have implications for other fields, such as environmental science, biophysics and chemical sensors.-2 -"2kyEi9FYSQjBVrZxIPQ.FHIAC_WRa02_review.doc", Datum: 19.02.03

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“…The characteristics of the FM/AF exchange coupling depend strongly on the microstructure and the thickness of the constituent materials. [3][4][5][6][7][8][9][10] The original simple model with a static AF spin structure does not account for the observed characteristics. 1 The importance of the AF domain wall with energy 4(A AF K AF ) 1/2 , where A AF and K AF are, respectively, the exchange stiffness and the anisotropy constant of the AF layer, 4 has been indicated by a number of recent micromagnetic calculations.…”

mentioning

confidence: 99%

Dependence of exchange coupling in permalloy/Cr82Al18 bilayers on the constituent layer thickness

Zhou

Chien

2000

Journal of Applied Physics

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Due to a weaker exchange coupling, the coercivity in permalloy/Cr82Al18 bilayers of thicknesses tFM and tAF, respectively, has been found to vary as 1/tFM3/2 at room temperature, a behavior previously only observed at low temperatures. At room temperature, the exchange field decreases when tAF is less than 40 nm and vanishes at 25 nm. Switching in wedged-permalloy/Cr82Al18 bilayers consists of two macroscopic domains with one domain wall moving along the wedge direction.

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Exchange biasing in MBE grown Fe3O4/CoO bilayers: The antiferromagnetic layer thickness dependence

Cited by 138 publications

References 9 publications

Exchange bias in a generalized Meiklejohn–Bean approach

Exchange bias in a generalized Meiklejohn–Bean approach

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Dependence of exchange coupling in permalloy/Cr82Al18 bilayers on the constituent layer thickness

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