Effect of spacer layer thickness on magnetic interactions in self-assembled single domain iron nanoparticles | Zendy

Nichole B. Herndon | Zendy; Sang Ho Oh | Zendy; Jeremiah T. Abiade | Zendy; Devdas Pai | Zendy; Jag Sankar | Zendy; Stephen J. Pennycook | Zendy; D. Kumar | Zendy

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Effect of spacer layer thickness on magnetic interactions in self-assembled single domain iron nanoparticles

Author(s) -

Nichole B. Herndon,

Sang Ho Oh,

Jeremiah T. Abiade,

Devdas Pai,

Jag Sankar,

Stephen J. Pennycook,

D. Kumar

Publication year - 2008

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.2833309

Subject(s) - materials science , coercivity , nanoparticle , magnetic nanoparticles , dipole , thin film , magnetization , pulsed laser deposition , magnetic domain , layer (electronics) , condensed matter physics , composite material , particle (ecology) , saturation (graph theory) , nanotechnology , magnetic field , chemistry , physics , organic chemistry , quantum mechanics , oceanography , mathematics , combinatorics , geology

The magnetic characteristics of iron nanoparticles embedded in an alumina thin film matrix have been studied as a function of spacer layer thickness. Alumina as well as iron nanoparticles were deposited in a multilayered geometry using sequential pulsed laser deposition. The role of spacer layer thickness was investigated by making layered thin film composites with three different spacer layer thicknesses (6, 12, and 18nm) with fixed iron particle size of ∼13nm. Intralayer magnetic interactions being the same in each sample, the variation in coercivity and saturation magnetization is attributed to thickness dependent interlayer magnetic interactions of three types: exchange, strong dipolar, and weak dipolar. A thin film composite multilayer structure offers a continuously tunable strength of interparticle dipole-dipole interaction and is thus well suited for studies of the influence of interaction on the magnetic properties of small magnetic particle systems.

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