A complex magnetic structure of ultrathin Fe films on Rh (001) surfaces

Takada, Masumi; Gastelois, Pedro Lana; Przybylski, M.; Kirschner, J.

doi:10.1016/j.jmmm.2012.10.010

Cited by 12 publications

(15 citation statements)

References 24 publications

(37 reference statements)

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“…The other intralayer exchange parameters in this layer are nearly zero. Our results indicate that the spin structure of 1 ML Fe/Rh(001) can be rather complicated, as reported recently [5]. The interlayer exchange parameters, describing the interaction between layers, show also a very complex pattern.…”

Section: Discussionsupporting

confidence: 83%

“…Experimentally, different magnetic structures such as AFM [24], magnetic "dead layer" [25,26], and complex AFM have been suggested for Fe films [5] (and also FeCo/Rh multilayers [27,28]) on Rh(001). The magnetic exchange parameters have not been measured in any of those experiments.…”

Section: Discussionmentioning

confidence: 99%

“…Prior to film deposition, the surface of the Rh(001) substrate was cleaned by cycles of Ar ion sputtering at 1.5 kV and a subsequent annealing at 900 K for 4 min [5]. Fe films with different thicknesses were grown by molecular beam epitaxy at 300 K. After the deposition of Fe, the samples underwent a slight annealing in order to improve the structural quality.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Direct evidence of antiferromagnetic exchange interaction in Fe(001) films: Strong magnon softening at the high-symmetryM¯point

et al. 2014

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We report on the direct observation of a large unusual antiferromagnetic exchange interaction in Fe(001) films. By measuring the magnon dispersion relation over the entire Brillouin zone of an ultrathin Fe(001) film on Rh(001), we demonstrate that the signature of this unusual antiferromagnetic exchange interaction can be observed at the high-symmetry M point. The exchange parameters are quantified by comparing the measured magnon dispersion relation with the results of our first-principles calculations. We suggest a way of examining the existence of an antiferromagnetic exchange interaction in layered magnetic structures and also a way of quantifying its strength.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Direct evidence of antiferromagnetic exchange interaction in Fe(001) films: Strong magnon softening at the high-symmetryM¯point

et al. 2014

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“…Magnetic thin films have long been a subject of study from both fundamental and applied points of view because of the special properties that make them appropriate for numerous technical devices, including sensors and actuators [ 1 , 2 ]. In particular, Fe and Fe-based films are attractive for these purposes because of their high saturation magnetization at room temperature, high magnetostriction, and controllable magnetic anisotropy through the appropriate selection of deposition techniques and conditions, such as growth temperature, type of substrate, underlayer, capping layer, incident plasma angle, and thickness [ 3 , 4 , 5 , 6 ]. These parameters also allow researchers to control certain properties, such as interfacial diffusion [ 7 ], interface roughness [ 8 ], and possible strain due to lattice mismatch between films and substrates [ 9 ], all of them having a noticeable influence on the magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Surface Roughness Influence on Néel-, Crosstie, and Bloch-Type Charged Zigzag Magnetic Domain Walls in Nanostructured Fe Films

2020

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Charged magnetic domain walls have been visualized in soft magnetic nanostructured Fe thin films under both static and dynamic conditions. A transition in the core of these zigzagged magnetic walls from Néel-type to Bloch-type through the formation of crosstie walls has been observed. This transition in charged zigzagged walls was not previously shown experimentally in Fe thin films. For film thicknesses t < 30 nm, Néel-type cores are present, while at t ≈ 33 nm, walls with crosstie cores are observed. At t > 60 nm, Bloch-type cores are observed. Along with the visualization of these critical parameters, the dependence on the film thickness of the characteristic angle and length of the segments of the zigzagged walls has been observed and analyzed. After measuring the bistable magneto-optical behavior, the values of the wall nucleation magnetic field and the surface roughness of the films, an energetic fit to these nucleation values is presented.

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“…Recent experimental advances using the SP-STM technique allow the investigation of complex magnetic structures (frustrated antiferromagnets, spin spirals, skyrmion lattices, etc.) [39,[41][42][43][44][45][46][47][48]. Considering such structures in reduced dimensions, their magnetic ground state can be determined [46,[49][50][51][52], and the nature of magnetic interactions can be studied by theoretical means, e.g., from first principles [53], or applying a multiscale approach [54].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional Wentzel-Kramers-Brillouin approach for the simulation of scanning tunneling microscopy and spectroscopy

2013

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We review the recently developed three-dimensional (3D) atom-superposition approach for simulating scanning tunneling microscopy (STM) and spectroscopy (STS) based on ab initio electronic structure data. In the method, contributions from individual electron tunneling transitions between the tip apex atom and each of the sample surface atoms are summed up assuming the one-dimensional (1D) Wentzel-Kramers-Brillouin (WKB) approximation in all these transitions. This 3D WKB tunneling model is extremely suitable to simulate spin-polarized STM and STS on surfaces exhibiting a complex noncollinear magnetic structure, i.e., without a global spin quantization axis, at very low computational cost. The tip electronic structure from first principles can also be incorporated into the model, that is often assumed to be constant in energy in the vast majority of the related literature, which could lead to a misinterpretation of experimental findings. Using this approach, we highlight some of the electron tunneling features on a prototype frustrated hexagonal antiferromagnetic Cr monolayer on Ag(111) surface. We obtain useful theoretical insights into the simulated quantities that is expected to help the correct evaluation of experimental results. By extending the method to incorporate a simple orbital dependent electron tunneling transmission, we reinvestigate the bias voltage-and tip-dependent contrast inversion effect on the W(110) surface. STM images calculated using this orbital dependent model agree reasonably well with Tersoff-Hamann and Bardeen results. The computational efficiency of the model is remarkable as the k-point samplings of the surface and tip Brillouin zones do not affect the computational time, in contrast to the Bardeen method. In a certain case we obtain a relative computational time gain of 8500 compared to the Bardeen calculation, without the loss of quality. We discuss the advantages and limitations of the 3D WKB method, and show further ways to improve and extend it.

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A complex magnetic structure of ultrathin Fe films on Rh (001) surfaces

Cited by 12 publications

References 24 publications

Direct evidence of antiferromagnetic exchange interaction in Fe(001) films: Strong magnon softening at the high-symmetryM¯point

Direct evidence of antiferromagnetic exchange interaction in Fe(001) films: Strong magnon softening at the high-symmetryM¯point

Surface Roughness Influence on Néel-, Crosstie, and Bloch-Type Charged Zigzag Magnetic Domain Walls in Nanostructured Fe Films

Three-dimensional Wentzel-Kramers-Brillouin approach for the simulation of scanning tunneling microscopy and spectroscopy

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