Optical-helicity-driven magnetization dynamics in metallic ferromagnets

Research output: Contribution to journalArticle

Abstract

Recent observations of switching of magnetic domains in ferromagnetic metals by circularly polarized light, so-called all-optical helicity dependent switching, has renewed interest in the physics that governs the interactions between the angular momentum of photons and the magnetic order parameter of materials. Here we use time-resolved-vectorial measurements of magnetization dynamics of thin layers of Fe, Ni and Co driven by picosecond duration pulses of circularly polarized light. We decompose the torques that drive the magnetization into field-like and spin-transfer components that we attribute to the inverse Faraday effect and optical spin-transfer torque, respectively. The inverse Faraday effect is approximately the same in Fe, Ni and Co, but the optical spin-transfer torque is strongly enhanced by adding a Pt capping layer. Our work provides quantitative data for testing theories of light-material interactions in metallic ferromagnets and multilayers.

Original languageEnglish (US)
Article number15085
JournalNature communications
Volume8
DOIs
StatePublished - Apr 18 2017

Fingerprint

Magnets
Torque
torque
Magnetization
Faraday effect
Light polarization
Light
magnetization
polarized light
Magnetic domains
Ferromagnetic materials
Angular momentum
Physics
magnetic domains
Photons
Multilayers
pulse duration
angular momentum
Metals
interactions

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Optical-helicity-driven magnetization dynamics in metallic ferromagnets. / Choi, Gyung Min; Schleife, André; Cahill, David G.

In: Nature communications, Vol. 8, 15085, 18.04.2017.

Research output: Contribution to journalArticle

@article{a78a3981cfed430aa9714b5fc82386d0,
title = "Optical-helicity-driven magnetization dynamics in metallic ferromagnets",
abstract = "Recent observations of switching of magnetic domains in ferromagnetic metals by circularly polarized light, so-called all-optical helicity dependent switching, has renewed interest in the physics that governs the interactions between the angular momentum of photons and the magnetic order parameter of materials. Here we use time-resolved-vectorial measurements of magnetization dynamics of thin layers of Fe, Ni and Co driven by picosecond duration pulses of circularly polarized light. We decompose the torques that drive the magnetization into field-like and spin-transfer components that we attribute to the inverse Faraday effect and optical spin-transfer torque, respectively. The inverse Faraday effect is approximately the same in Fe, Ni and Co, but the optical spin-transfer torque is strongly enhanced by adding a Pt capping layer. Our work provides quantitative data for testing theories of light-material interactions in metallic ferromagnets and multilayers.",
author = "Choi, {Gyung Min} and Andr{\'e} Schleife and Cahill, {David G.}",
year = "2017",
month = "4",
day = "18",
doi = "10.1038/ncomms15085",
language = "English (US)",
volume = "8",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",

}

TY - JOUR

T1 - Optical-helicity-driven magnetization dynamics in metallic ferromagnets

AU - Choi, Gyung Min

AU - Schleife, André

AU - Cahill, David G.

PY - 2017/4/18

Y1 - 2017/4/18

N2 - Recent observations of switching of magnetic domains in ferromagnetic metals by circularly polarized light, so-called all-optical helicity dependent switching, has renewed interest in the physics that governs the interactions between the angular momentum of photons and the magnetic order parameter of materials. Here we use time-resolved-vectorial measurements of magnetization dynamics of thin layers of Fe, Ni and Co driven by picosecond duration pulses of circularly polarized light. We decompose the torques that drive the magnetization into field-like and spin-transfer components that we attribute to the inverse Faraday effect and optical spin-transfer torque, respectively. The inverse Faraday effect is approximately the same in Fe, Ni and Co, but the optical spin-transfer torque is strongly enhanced by adding a Pt capping layer. Our work provides quantitative data for testing theories of light-material interactions in metallic ferromagnets and multilayers.

AB - Recent observations of switching of magnetic domains in ferromagnetic metals by circularly polarized light, so-called all-optical helicity dependent switching, has renewed interest in the physics that governs the interactions between the angular momentum of photons and the magnetic order parameter of materials. Here we use time-resolved-vectorial measurements of magnetization dynamics of thin layers of Fe, Ni and Co driven by picosecond duration pulses of circularly polarized light. We decompose the torques that drive the magnetization into field-like and spin-transfer components that we attribute to the inverse Faraday effect and optical spin-transfer torque, respectively. The inverse Faraday effect is approximately the same in Fe, Ni and Co, but the optical spin-transfer torque is strongly enhanced by adding a Pt capping layer. Our work provides quantitative data for testing theories of light-material interactions in metallic ferromagnets and multilayers.

UR - http://www.scopus.com/inward/record.url?scp=85017521114&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85017521114&partnerID=8YFLogxK

U2 - 10.1038/ncomms15085

DO - 10.1038/ncomms15085

M3 - Article

C2 - 28416803

AN - SCOPUS:85017521114

VL - 8

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

M1 - 15085

ER -