Photo-switching of magnetization in iron nanoparticles

Nabil Al-Aqtash, Renat F Sabirianov

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report the theoretical study of the light-induced switching of magnetization in core-shell nanoparticles. The core of the nanoparticle is made of iron (Fe) coated with the shell of azobenzene. Azobenzene is a photochromic material with reversible trans-cis photoisomerization upon irradiation by UV and visible light. The magnetization of nanoparticles can be reversibly switched using specific wavelengths of light. Using an ab initio parameterization of magnetic interactions we performed Monte Carlo simulations of the magnetization of the core-shell nanoparticle as a function of temperature. The results show that Fe nanoparticle magnetization can be switched by at least 50% because of the photoisomerization of azobenzene at room temperature. Ab initio calculations show that the exchange interaction in Fe dimer is ferromagnetic (FM), and shows a strong modification of exchange interaction parameters by 40% because of the trans-cis photoisomerization of azobenzene. An infinite planar Fe monolayer mimicking the surface of nanoparticle shows a strong modification of exchange interaction parameters (up to 50%) in the monolayer due to trans-cis photoisomerization. The local magnetic moments of Fe sheet increase by only 0.5% due to photoisomerization. This journal is

Original languageEnglish (US)
Pages (from-to)6873-6878
Number of pages6
JournalJournal of Materials Chemistry C
Volume2
Issue number33
DOIs
StatePublished - Sep 7 2014

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Photoisomerization
Magnetization
Azobenzene
Iron
Nanoparticles
Exchange interactions
Monolayers
Parameterization
Magnetic moments
Dimers
Irradiation
Wavelength
Temperature
azobenzene

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

Photo-switching of magnetization in iron nanoparticles. / Al-Aqtash, Nabil; Sabirianov, Renat F.

In: Journal of Materials Chemistry C, Vol. 2, No. 33, 07.09.2014, p. 6873-6878.

Research output: Contribution to journalArticle

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AB - We report the theoretical study of the light-induced switching of magnetization in core-shell nanoparticles. The core of the nanoparticle is made of iron (Fe) coated with the shell of azobenzene. Azobenzene is a photochromic material with reversible trans-cis photoisomerization upon irradiation by UV and visible light. The magnetization of nanoparticles can be reversibly switched using specific wavelengths of light. Using an ab initio parameterization of magnetic interactions we performed Monte Carlo simulations of the magnetization of the core-shell nanoparticle as a function of temperature. The results show that Fe nanoparticle magnetization can be switched by at least 50% because of the photoisomerization of azobenzene at room temperature. Ab initio calculations show that the exchange interaction in Fe dimer is ferromagnetic (FM), and shows a strong modification of exchange interaction parameters by 40% because of the trans-cis photoisomerization of azobenzene. An infinite planar Fe monolayer mimicking the surface of nanoparticle shows a strong modification of exchange interaction parameters (up to 50%) in the monolayer due to trans-cis photoisomerization. The local magnetic moments of Fe sheet increase by only 0.5% due to photoisomerization. This journal is

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