Asymmetry of domain nucleation and enhanced coercivity in exchange-biased epitaxial NiO/NiFe bilayers

Никитенко, В. И.; Gornakov, V. S.; Dedukh, L. M.; Kabanov, Yuri; Khapikov, A. F.; Shapiro, Alexander J.; Shull, Robert D.; Chaiken, A.; Michel, R. P.

doi:10.1103/physrevb.57.r8111

Cited by 143 publications

(72 citation statements)

References 21 publications

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“…H a 0. Domain observations in some AF͞F systems seem to indicate that the locations of domain nucleation in the increasing or decreasing branches of the loop are different [16]. This is consistent with the frequent observation of asymmetrically shaped hysteresis loops as seen by many experimenters [12][13][14][15].…”

supporting

confidence: 68%

Asymmetric Magnetization Reversal in Exchange-Biased Hysteresis Loops

et al. 2000

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Polarized neutron reflectometry is used to probe the in-plane projection of the net-magnetization vector M of polycrystalline Fe films exchange coupled to twinned (110) MnF 2 or FeF 2 antiferromagnetic (AF) layers. The magnetization reversal mechanism depends upon the orientation of the cooling field with respect to the twinned microstructure of the AF, and whether the applied field is increased to (or decreased from) a positive saturating field; i.e., the magnetization reversal is asymmetric. The reversal of the sample magnetization from one saturated state to the other occurs via either domain wall motion or magnetization rotation on opposite sides of the same hysteresis loop.

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supporting

confidence: 68%

Asymmetric Magnetization Reversal in Exchange-Biased Hysteresis Loops

et al. 2000

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“…16 Direct observation of AF domains is difficult, but the observation of FM domains coupled to the AF provides indirect evidence of their existence. 6,16 Nikitenko et al 18 have investigated the asymmetric magnetization reversal process in the epitaxial NiO/NiFe system using the magneto-optic indicator film technique to observe domain formation.…”

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confidence: 99%

Variation of domain formation in a 15 nm NiFe layer exchange coupled with NiO layers of different thicknesses

Liu¹,

Adenwalla²

2003

Applied Physics Letters

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The correlation between ferromagnetic domain formation and exchange bias in a series of NiFe/NiO samples with varying NiO thicknesses has been investigated using the magneto-optic Kerr effect and magnetic force microscopy. Below a critical thickness (15 nm) of NiO, the exchange bias HE is zero and ripple domains exist in the NiFe layer. Above this critical thickness, cross-tie type domain walls appear concurrently with the appearance of exchange bias. Both the number of cross-tie domain walls and the exchange bias increase with an increase in NiO thickness, reaching a maximum at 35 nm NiO, after which both show a gradual decrease. This variation of domain wall formation in the NiFe layer with the NiO thickness possibly reflects the variation of the domain structure in the NiO layer through interfacial exchange coupling.

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“…From previous studies, it is expected that such irregular columnar structures of CoO will act as domain-pinning defects to alter the usual magnetic properties in these CoO/Co bilayers, as well as changing the dipolar interactions between cobalt-rich columns, 8) modulating the local Néel temperature 9) or introducing disordered crystal fields. 10) Figure 2 . In addition to this, the average maximum magnetization of the bilayer film was reduced to approximately 455 emu/cm 3 for the 115-nm-thick film.…”

Section: Experimental Methodsmentioning

confidence: 99%

Probing Exchange Bias Effects in CoO/Co Bilayers with Pillar-Like CoO Structures

Cortie

Shueh

Chen

et al. 2012

Jpn. J. Appl. Phys.

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Exchange bias effects in CoO/Co bilayers fabricated by ion-assisted deposition were studied as a function of CoO thickness. During the deposition of the top CoO layer, pillar-like CoO structures were embedded in the underlying Co layer due to implantation of oxygen ions. The enhanced coercivity was attributed to the changes in the magnetic reversal mechanism in the ferromagnetic Co layer due to the penetration of pillar-like structures of antiferromagnetic CoO. At low temperature, we found a strong exchange bias field. Our measurements indicate that the exchange bias effect can exist in a nanocomposite system that has a disordered mixture of columnar and planar Co/CoO interfaces.

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Asymmetry of domain nucleation and enhanced coercivity in exchange-biased epitaxial NiO/NiFe bilayers

Cited by 143 publications

References 21 publications

Asymmetric Magnetization Reversal in Exchange-Biased Hysteresis Loops

Asymmetric Magnetization Reversal in Exchange-Biased Hysteresis Loops

Variation of domain formation in a 15 nm NiFe layer exchange coupled with NiO layers of different thicknesses

Probing Exchange Bias Effects in CoO/Co Bilayers with Pillar-Like CoO Structures

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