Manipulation of domain walls using a spin-polarized STM

Wieser, Robert; Stapelfeldt, T.; Vedmedenko, E. Y.; Wiesendanger, R.

doi:10.1209/0295-5075/97/17009

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…In an independent study, Yamada et al repeated the same measurement on a system with Mn on top of Fe(001), but found the domain-wall width to be nearly independent of the Mn thickness [19]. Similar frustrated spin configurations have also been reported in other systems [8,9,[20][21][22][23][24][25][26][27][28][29][30]. The frustration induced domain wall in nanorings is considered to lead to potential logic and memory applications [31].…”

Section: Introductionmentioning

confidence: 72%

General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding

Chen

Sun

et al. 2019

New J. Phys.

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We present a study of the magnetic configuration due to step-induced magnetic frustration at ferromagnetic/antiferromagnetic (FM/AFM) interfaces. At a substrate monatomic step edge, a 180°d omain wall emerges. A physically appealing form for the thickness dependence of the domain wall width is obtained. It follows a universal behaviour in the whole thickness range, from ultrathin film to bulk and in both cases of an AFM domain wall on top of the FM layer and a FM domain wall on top of an AFM substrate. In the ultrathin limit of the capping layer, the domain wall grows linearly with the slope depending only on the ratio of the inter-layer and intra-layer Heisenberg exchange constants, regardless of the presence of magneto-crystalline anisotropy. These findings are in good agreement with previous experimental observations. As the thickness grows beyond the ultrathin regime, the corresponding thickness dependence departs from linearity and tends to its bulk value. The analytical insights are supported by conclusive numerical simulations of two independent varieties, namely, the Monte Carlo method which also includes the growth kinetics and the object oriented micromagnetic framework based micromagnetic simulations. While the quantitative details of the study are naturally dependent on the specific material parameters of the complex magnetic system, the global features of the spin texture in the capping layer are dictated by the topological step-edge defect. The latter in itself is quantifiable by a winding number of  . z J J J J DW 0 s d s d 4 4 2 2| This again proves that the domain wall width at the ultrathin limit is independent of the strength and type of magneto-crystalline anisotropy. -J J 5 10 Jm , s d 13 1 and =´-K 2.56 10 J m . 4 3 Figure 5(a) presents the comparison of the thickness dependent domain wall boundary for two-fold and four-fold magnetic anisotropy cases utilizing the same = = J J J J 4 , 4 , s s d d 0 0 and = K K 0 where = = J J Proof: We denote the spin distribution in figure 1(a) as j, while that in figure 1(b) as j. The most important difference between the two systems is the interlayer exchange coupling constant, J d for the frustrated FM system and = -J J d d for the frustrated AFM system. Other parameters are the same, i.e. = J J , s s = K K.

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Section: Introductionmentioning

confidence: 72%

General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding

Chen

Sun

et al. 2019

New J. Phys.

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“…The actual limit in case of a spin S=1/2 system is 40 spins using exact diagonalization. In comparison to the 40 spins, we have approximately 4 million spins in case of the classical description [35][36][37][38][39]. The reason for the restriction to a small number of quantum spins are the large matrices we have to deal with.…”

Section: Comment On the Practical Usementioning

confidence: 99%

Some remarks about the time-dependent Schrödinger equation with damping

Wieser¹,

Yang²

2019

J. Phys. Commun.

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The missing derivation of the time-dependent Schrödinger equation following Schrödinger's original description of the time-independent Schrödinger equation. Also, this description is extended to derive the Caldirola-Kanai, the Schuch-Schrödinger, and the Gisin-Schrödinger equation. In the second part, the Gisin-Schrödinger equation will be derived once more using the Ito formalism of stochastic differential equations. Furthermore, we discuss the extension to larger spin-system using the cluster mean-field theory.

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“…2b) Despite the creation and annihilation of Skyrmions the scanning tunneling microscope can be also used to move Skyrmions. The possibility to shift domain walls has been discussed in [22,23]. Fig.…”

Section: The First Step Toward This Direction Has Been Already Done mentioning

confidence: 99%

Manipulation of magnetic skyrmions with a scanning tunneling microscope

2017

Self Cite

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The dynamics of a single magnetic Skyrmion in an atomic spin system under the influence of Scanning Tunneling Microscope is investigated by computer simulations solving the LandauLifshitz-Gilbert equation. Two possible scenarios are described: manipulation with aid of a spinpolarized tunneling current and by an electric field created by the scanning tunneling microscope.The dynamics during the creation and annihilation process is studied and the possibility to move single Skyrmions is showed.

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Manipulation of domain walls using a spin-polarized STM

Cited by 8 publications

References 26 publications

General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding

General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding

Some remarks about the time-dependent Schrödinger equation with damping

Manipulation of magnetic skyrmions with a scanning tunneling microscope

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