Theory of high-resolution tunneling spin transport on a magnetic skyrmion

Palotás, Krisztián; Rózsa, Levente; Szunyogh, L.

doi:10.1103/physrevb.97.174402

Cited by 2 publications

(14 citation statements)

References 80 publications

(122 reference statements)

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“…3. The STT minima correlate very well with the maxima and minima of the charge current 42 , and the reversal of the tip magnetization orientations would not change the STT magnitude images in the first column of Fig. 6.…”

mentioning

confidence: 71%

“…Note that the effective spin polarization (P eff = P S P T ) only enters the charge current and the out-of-plane torque expressions, and not the longitudinal spin current and the in-plane torque. This means that P eff is not sufficient to characterize the spin polarization of the magnetic tunnel junction concerning spin transport quantities, and P S and P T are independent parameters in the tunneling model 42 .…”

Section: A 3d-wkb Electron Tunneling Theorymentioning

confidence: 99%

“…The STT minima and maxima with out-of-plane magnetized tips are respectively obtained where the tip is placed above regions with dominating out-of-plane and in-plane spin components. This also means that the STT minima are obtained at the regions, where the charge current has minima or maxima 42 . The STT minima show up as blue regions and the maxima as red rings in each image in the first column of Fig.…”

Section: Spin Transport Characteristics Of the Skyrmionsmentioning

confidence: 99%

“…Beside the spin-polarized charge current, the calculation of tunneling spin transport quantities, the LSC and the STT, was first proposed taking collinear magnets in the magnetic tunnel junction 41 . The extension to noncollinear magnetic surfaces delivered important insights to the high-resolution charge transport properties of skyrmionic objects with various topologies 37 and to the high-resolution vector spin transport characteristics of an individual skyrmion 42 . The 3D-WKB electron tunneling theory is implemented in the 3D-WKB-STM code 60 .…”

Section: A 3d-wkb Electron Tunneling Theorymentioning

confidence: 99%

“…Taking Néel-and Bloch-type skyrmions within the same topology class, with cycloidal and helical domain walls, respectively, a comparison of the tunneling charge and spin transport characteristics of eight distinct skyrmions is provided. An electron tunneling theory for the consistently combined description of charge and vector spin transport in magnetic STM junctions within the three-dimensional (3D) Wentzel-Kramers-Brillouin (WKB) framework 41,42 is employed. It is shown that the charge current SP-STM images can be used to determine the helicity of the skyrmions.…”

Section: Introductionmentioning

confidence: 99%

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High-resolution combined tunneling electron charge and spin transport theory of Néel and Bloch skyrmions

Palotás

2018

Phys. Rev. B

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Based on a combined charge and vector spin transport theory capable of imaging noncollinear magnetic textures on surfaces with spin-polarized scanning tunneling microscopy (SP-STM), the high-resolution tunneling electron charge and coupled spin transport properties of a variety of Néeland Bloch-type skyrmions are investigated. Axially symmetric skyrmions are considered within the same topology class characterized by a vorticity value of m = 1, and their helicities are varied by taking γ = 0 and π values for the Néel skyrmions and γ = −π/2 and π/2 values for the Bloch skyrmions. Depending on the orientation of the magnetization of the STM tip as well as on the helicity and the time-reversal of the skyrmionic spin structures, several relationships between their spin transport vector components, the in-plane and out-of-plane spin transfer torque and the longitudinal spin current, are identified. The magnitudes of the spin transport vector quantities show close relation to standard charge current SP-STM images. It is also demonstrated that the SP-STM images can be used to determine the helicity of the skyrmions. Moreover, the modified spin polarization vectors of the conduction electrons due to the local chirality of the complex spin texture are incorporated into the tunneling model. It is found that this effect modifies the apparent size of the skyrmions. These results contribute to the proper identification of topological surface magnetic objects imaged by SP-STM, and deliver important parameters for current-induced spin dynamics.

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mentioning

confidence: 71%

Section: A 3d-wkb Electron Tunneling Theorymentioning

confidence: 99%

Section: Spin Transport Characteristics Of the Skyrmionsmentioning

confidence: 99%