Reversible photoswitching of ferromagnetic FePt nanoparticles at room temperature

Masayuki Suda, Masaru Nakagawa, Tomokazu Iyoda, Yasuaki Einaga

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

There has been a great interest in developing photoswitchable magnetic materials because of their possible applications for future high-density information storage media. In fact, however, the examples reported so far did not show ferromagnetic behavior at room temperature. From the viewpoint of their practical application to magnetic recording systems, the ability to fix their magnetic moments such that they still exhibit room-temperature ferromagnetism is an absolute requirement. Here, we have designed reversible photoswitchable ferromagnetic FePt nanoparticles whose surfaces were coated with azobenzene-derivatized ligands. On the surfaces of core particles, reversible photoisomerization of azobenzene in the solid state was realized by using spacer ligands that provide sufficient free volume. These photoisomerizations brought about changes in the electrostatic field around the core-FePt nanoparticles. As a result, we have succeeded in controlling the magnetic properties of these ferromagnetic composite nanoparticles by alternating the photoillumination in the solid state at room temperature.

Original languageEnglish
Pages (from-to)5538-5543
Number of pages6
JournalJournal of the American Chemical Society
Volume129
Issue number17
DOIs
Publication statusPublished - 2007 May 2

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Nanoparticles
Photoisomerization
Azobenzene
Temperature
Ligands
Magnetic recording
Information Storage and Retrieval
Ferromagnetism
Magnetic materials
Free volume
Magnetic moments
Static Electricity
Magnetic properties
Electric fields
Data storage equipment
Composite materials
azobenzene

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Reversible photoswitching of ferromagnetic FePt nanoparticles at room temperature. / Suda, Masayuki; Nakagawa, Masaru; Iyoda, Tomokazu; Einaga, Yasuaki.

In: Journal of the American Chemical Society, Vol. 129, No. 17, 02.05.2007, p. 5538-5543.

Research output: Contribution to journalArticle

Suda, Masayuki ; Nakagawa, Masaru ; Iyoda, Tomokazu ; Einaga, Yasuaki. / Reversible photoswitching of ferromagnetic FePt nanoparticles at room temperature. In: Journal of the American Chemical Society. 2007 ; Vol. 129, No. 17. pp. 5538-5543.
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