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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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 Néel- and 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.

Original languageEnglish
Article number094409
JournalPhysical Review B
Volume98
Issue number9
DOIs
Publication statusPublished - Sep 10 2018

Fingerprint

Electron tunneling
transport theory
Scanning tunneling microscopy
electron tunneling
high resolution
Textures
Electron transport properties
Spin dynamics
Spin polarization
Chirality
Induced currents
scanning tunneling microscopy
Vorticity
Magnetization
Torque
Topology
Imaging techniques
Electrons
textures
spin dynamics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

High-resolution combined tunneling electron charge and spin transport theory of Néel and Bloch skyrmions. / Palotás, K.

In: Physical Review B, Vol. 98, No. 9, 094409, 10.09.2018.

Research output: Contribution to journalArticle

@article{9b6f61ed99544265ab9f8b251e88faa5,
title = "High-resolution combined tunneling electron charge and spin transport theory of N{\'e}el and Bloch skyrmions",
abstract = "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 N{\'e}el- and 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 N{\'e}el 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.",
author = "K. Palot{\'a}s",
year = "2018",
month = "9",
day = "10",
doi = "10.1103/PhysRevB.98.094409",
language = "English",
volume = "98",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "9",

}

TY - JOUR

T1 - High-resolution combined tunneling electron charge and spin transport theory of Néel and Bloch skyrmions

AU - Palotás, K.

PY - 2018/9/10

Y1 - 2018/9/10

N2 - 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 Néel- and 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.

AB - 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 Néel- and 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.

UR - http://www.scopus.com/inward/record.url?scp=85053192874&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85053192874&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.98.094409

DO - 10.1103/PhysRevB.98.094409

M3 - Article

AN - SCOPUS:85053192874

VL - 98

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 9

M1 - 094409

ER -