scholarly journals Quantitative understanding of magnetic vortex oscillations driven by spin-polarized out-of-plane dc current: Analytical and micromagnetic numerical study

2009 ◽  
Vol 79 (18) ◽  
Author(s):  
Youn-Seok Choi ◽  
Ki-Suk Lee ◽  
Sang-Koog Kim
Keyword(s):  
Numerical Study ◽  
Magnetic Vortex ◽  
Spin Polarized ◽  
Out Of Plane ◽  
Quantitative Understanding ◽  
Dc Current

scholarly journals Understanding eigenfrequency shifts observed in vortex gyrotropic motions in a magnetic nanodot driven by spin-polarized out-of-plane dc current

2008 ◽  
Vol 93 (18) ◽  
pp. 182508 ◽  
Author(s):  
Youn-Seok Choi ◽  
Sang-Koog Kim ◽  
Ki-Suk Lee ◽  
Young-Sang Yu
Keyword(s):  
Spin Polarized ◽  
Out Of Plane ◽  
Dc Current

Effect of Dzyaloshinskii-Moriya interaction on the magnetic vortex oscillator driven by spin-polarized current

2015 ◽  
Vol 117 (17) ◽  
pp. 17B720 ◽  
Author(s):  
Shujun Chen ◽  
Senfu Zhang ◽  
Qiyuan Zhu ◽  
Xianyin Liu ◽  
Chendong Jin ◽  
...  
Keyword(s):  
Magnetic Vortex ◽  
Spin Polarized ◽  
Moriya Interaction

Influence of Dzyaloshinskii-Moriya interaction on the magnetic vortex gyration driven by a spin-polarized current

2020 ◽  
Vol 515 ◽  
pp. 167291
Author(s):  
Huanan Li ◽  
Dan Wang ◽  
Yifan Zhao ◽  
Yue Hu ◽  
Ziwei Fan ◽  
...  
Keyword(s):  
Magnetic Vortex ◽  
Spin Polarized ◽  
Moriya Interaction

scholarly journals Towards Laterally Resolved Ferromagnetic Resonance with Spin-Polarized Scanning Tunneling Microscopy

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 827
Author(s):  
Marie Hervé ◽  
Moritz Peter ◽  
Timofey Balashov ◽  
Wulf Wulfhekel
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Ferromagnetic Resonance ◽  
Tunneling Current ◽  
Magnetic Vortex ◽  
Scanning Tunneling ◽  
Tunneling Junction ◽  
Resonance Signal ◽  
Tunneling Microscopy ◽  
Spin Polarized ◽  
Local Detection

We used a homodyne detection to investigate the gyration of magnetic vortex cores in Fe islands on W(110) with spin-polarized scanning tunneling microscopy at liquid helium temperatures. The technique aims at local detection of the spin precession as a function of frequency using a radio-frequency (rf) modulation of the tunneling bias voltage. The gyration was excited by the resulting spin-polarized rf current in the tunneling junction. A theoretical analysis of different contributions to the frequency-dependent signals expected in this technique is given. These include, besides the ferromagnetic resonance signal, also signals caused by the non-linearity of the I ( U ) characteristics. The vortex gyration was modeled with micromagnetic finite element methods using realistic parameters for the tunneling current, its spin polarization, and the island shape, and simulations were compared with the experimental results. The observed signals are presented and critically analyzed.

Study of arching behaviour and strength of concrete masonry infills under out-of-plane loading

2019 ◽  
Vol 46 (10) ◽  
pp. 896-908 ◽  
Author(s):  
Ehsan Nasiri ◽  
Yi Liu
Keyword(s):  
Numerical Study ◽  
Three Dimensional ◽  
Element Model ◽  
Contributing Factors ◽  
Concrete Frames ◽  
Masonry Infills ◽  
Concrete Masonry ◽  
Wide Range ◽  
Out Of Plane ◽  
Three Dimensional Finite Element

A numerical study using a three-dimensional finite element model was conducted to investigate the arching behaviour and strength of concrete masonry infills bounded by reinforced concrete frames subjected to out-of-plane loading. Physical specimens were concurrently tested to provide results for validation of the model as well as evidence of directional characteristics of arching behaviour of masonry infills. A subsequent parametric study using the model included a wide range of infilled frame geometric properties. The results showed in detail the difference in one-way and two-way arching in terms of both strength and failure mechanism, and the contributing factors to this difference. Evaluation of the two main design equations for out-of-plane strength of masonry infills led to proposal of modifications to provide a more rational consideration of directional behaviour of concrete masonry infills. A comparison study using the available test results showed a marked improvement of strength prediction based on the proposed modification.

scholarly journals Stiffness in vortex—like structures due to chirality-domains within a coupled helical rare-earth superlattice

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Amitesh Paul
Keyword(s):  
Rare Earth ◽  
Domain Walls ◽  
Topological Defects ◽  
Magnetic Ordering ◽  
Direct Consequence ◽  
Magnetic Vortex ◽  
Range Magnetic Order ◽  
Wide Range ◽  
Out Of Plane ◽  
The Stability

Abstract Vortex domain walls poses chirality or ‘handedness’ which can be exploited to act as memory units by changing their polarity with electric field or driving/manupulating the vortex itself by electric currents in multiferroics. Recently, domain walls formed by one dimensional array of vortex—like structures have been theoretically predicted to exist in disordered rare-earth helical magnets with topological defects. Here, in this report, we have used a combination of two rare-earth metals, e.g."Equation missing" superlattice that leads to long range magnetic order despite their competing anisotropies along the out-of-plane (Er) and in-plane (Tb) directions. Probing the vertically correlated magnetic structures by off-specular polarized neutron scattering we confirm the existence of such magnetic vortex—like domains associated with magnetic helical ordering within the Er layers. The vortex—like structures are predicted to have opposite chirality, side—by—side and are fairly unaffected by the introduction of magnetic ordering between the interfacial Tb layers and also with the increase in magnetic field which is a direct consequence of screening of the vorticity in the system due to a helical background. Overall, the stability of these vortices over a wide range of temperatures, fields and interfacial coupling, opens up the opportunity for fundamental chiral spintronics in unconventional systems.

Magnetic Domain Imaging of Epitaxial thin Films by Spin-Polarized Scanning Electron Microscopy

1991 ◽  
Vol 231 ◽  
Author(s):  
R. Allenspach ◽  
M. Stampanoni
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Domain ◽  
Domain Size ◽  
Epitaxial Thin Films ◽  
Continuous Rotation ◽  
Spin Polarized ◽  
Out Of Plane ◽  
Micrometer Size ◽  
Scanning Electron

AbstractThe formation of magnetic domains in thin epitaxial Co/Au(111) films is investigated by spin-polarized scanning electron microscopy. Three-monolayer films are shown to decay into out-of-plane domains of micrometer size. The transition from out-of-plane to in-plane magnetization at a crossover thickness of 4.5 layers is followed by imaging the domains, and the transition is shown to occur as a continuous rotation of the magnetization. The domain size in field-free-grown perpendicular films depends linearly on film thickness. From high-resolution line scans across magnetization reversals we determine the resolution in magnetic imaging to be better than 40 nm.

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