Magnetic anisotropies of epitaxial Fe/MgO(001) films with varying thickness and grown under different conditions

Zhan, Qingfeng; Vandezande, Stijn; Temst, Kristiaan; Haesendonck, C. Van

doi:10.1088/1367-2630/11/6/063003

Cited by 47 publications

(44 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Certainly, the φ dependence of switching fields for Fe single layer, i.e., t MnPd = 0, can be nicely fitted 24 , by the DW nucleation model with ε 90 o /M = 5.0 Oe, K u /M = 2.4 Oe, and K eb /M = 0 Oe. It should be noticed that according to the reversal mechanism caused by two successive 90 o DW nucleations, the switching fields for the square loops are fitted by H c1 and H c3 , but not H c derived from the 180 o DW nucleation [20].…”

Section: Magnetization Reversal Mechanismmentioning

confidence: 80%

“…Figure 3(a) presents the φ dependence of the switching fields for t MnPd = 10 nm. 24 . With further increasing t MnPd to 20 and 30 nm, the bilayers show a clear H eb .…”

Section: Resultsmentioning

confidence: 99%

“…Depending on the initial and the final remanant directions involved in a magnetic transition, we refer to the corresponding switching fields as H c1 to H c4 and H cI to H cIV , respectively. For the switching from the [0 Similar to Fe/MgO(001) films we previously produced by using molecular beam epitaxy (MBE) 24 , the present Fe single layer grown by IBS, i.e., t MnPd = 0, exhibits the square and the double-side two-step loops for φ close to 0 o and 90…”

Section: Methodsmentioning

confidence: 99%

“…Considering a weak K u parallel to the [010] axis, we have previously shown that both the one-step and the two-step loops observed in epitaxial Fe/MgO(001) films are mediated by two successive or two separate 90 o DW nucleations 20,24 . The strength of K u and the DW nucleation energy ε 90 o can be evaluated by fitting the φ dependence of switching fields.…”

Section: Magnetization Reversal Mechanismmentioning

confidence: 99%

See 3 more Smart Citations

Antiferromagnetic layer thickness dependence of the magnetization reversal in the epitaxial MnPd/Fe exchange bias system

2011

Self Cite

View full text Add to dashboard Cite

We report an investigation on the antiferromagnetic layer thickness dependence of magnetization reversal in c-axis oriented MnPd/Fe epitaxial exchange biased bilayers. Several kinds of multi-step loops were observed for different samples measured at various field orientation. The evolution of the angular dependent magnetic behavior evolving from a representative Fe film to the exchange biased bilayers was revealed. With increase of the thickness of the antiferromagnetic layers, asymmetrically shaped loops and biased two-step loops are induced by exchange bias. Including the unidirectional anisotropy, a model based on the domain nucleation and propagation was developed, which can nicely describe the evolution of the magnetic behaviors for MnPd/Fe bilayers and correctly predicts the critical angles separating the occurrence of different magnetic switching processes. For fields applied along the bias direction, the 180 o magnetic reversal changes from two successive 90 o domain wall nucleations to a single 180 o domain wall nucleation at a critical thickness of the MnPd layer.

show abstract

Section: Magnetization Reversal Mechanismmentioning

confidence: 80%

“…Figure 3(a) presents the φ dependence of the switching fields for t MnPd = 10 nm. 24 . With further increasing t MnPd to 20 and 30 nm, the bilayers show a clear H eb .…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Magnetization Reversal Mechanismmentioning

confidence: 99%

See 2 more Smart Citations

Antiferromagnetic layer thickness dependence of the magnetization reversal in the epitaxial MnPd/Fe exchange bias system

2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…16 Such anisotropies have previously been observed in Fe grown on GaAs, and attributed to effects at the substrate-film interface. 17 Strain arising from substrate miscuts can also cause an enhanced uniaxial anisotropy, 18 suggesting a slight modification of epitaxial strain with increasing Dy content. The linewidth of resonance, ∆H, which has both intrinsic (Gilbert) and extrinsic (two-magnon scattering and inhomogeneous broadening) contributions, and is given by 19…”

mentioning

confidence: 99%

Tailoring of magnetic properties of ultrathin epitaxial Fe films by Dy doping

et al. 2015

View full text Add to dashboard Cite

We report on the controlled modification of relaxation parameters and magnetic moments of epitaxial Fe thin films through Dy doping. Ferromagnetic resonance measurements show that an increase of Dy doping from 0.1% to 5% gives a tripling in Gilbert damping, and more importantly a strongly enhanced anisotropic damping that can be qualitatively understood through the slow-relaxing impurity model. X-ray magnetic circular dichroism measurements show a pronounced suppression of the orbital moment of the Fe with Dy doping, leading to an almost threefold drop in the orbital to spin moment ratio, ml/ms. Doping with Dy can therefore be used to control both dynamic and static properties of thin ferromagnetic films for improved performance in spintronics device applications, mediated through the antiferromagnetic interaction of the 4f and 3d states.

show abstract

Electrooxidation of Ammonia at Tuned (100)Pt Surfaces by using Epitaxial Thin Films

et al. 2015

View full text Add to dashboard Cite

PtxNi100−x thin films (72≤x≤100, 10–25 nm thick) were deposited on MgO (100) substrates by using pulsed laser deposition. As shown from X‐ray diffraction analysis, the formation of a Pt(Ni) solid solution was observed over the Ni range investigated. All PtNi‐based films showed epitaxial growth in the (100) direction at 350 °C, which is in contrast to pure Pt films, where a Ni seeding layer was required to obtain epitaxial deposits at this temperature. X‐ray photoelectron spectroscopy depth‐profile analyses showed a Ni enrichment at the PtNi/MgO interface, which may be at the origin of the epitaxial growth in the alloys. After immersion in acidic media, Ni atoms are totally dissolved from the first ten atomic layers of the PtNi films, forming pure Pt electrodes. On the basis of underpotential‐deposited hydrogen electrochemical analyses, a (100) preferential surface orientation of the crystallites originating from epitaxial growth was confirmed on both Ptseeded and PtxNi100−x films. It was shown that the fraction of (100) terraces and terrace edge sites are a determining factor in the electrooxidation of NH3. The highest electrocatalytic activity was observed with the Ptseeded film.

show abstract

Magnetic anisotropies of epitaxial Fe/MgO(001) films with varying thickness and grown under different conditions

Cited by 47 publications

References 31 publications

Antiferromagnetic layer thickness dependence of the magnetization reversal in the epitaxial MnPd/Fe exchange bias system

Antiferromagnetic layer thickness dependence of the magnetization reversal in the epitaxial MnPd/Fe exchange bias system

Tailoring of magnetic properties of ultrathin epitaxial Fe films by Dy doping

Electrooxidation of Ammonia at Tuned (100)Pt Surfaces by using Epitaxial Thin Films

Contact Info

Product

Resources

About