Abstract
In this paper, we report on the magnetic properties of isolated nanoparticles andinteracting nanochains formed by the self-assembly of Ni nanoparticles. The magneticproperties were studied using superconducting quantum interference device (SQUID)magnetometry and magnetic force microscopy (MFM). We demonstrate that single-domainNi nanoparticles spontaneously form one-dimensional (1D) chains under the influence of anexternal magnetic field. Furthermore, such magnetic field-driven self-assembly inconjunction with surface templating produces regular arrays of 1D nanochains withantiferromagnetic intra-chain order. The antiferromagnetic order, which is in strikingcontrast to what is found for non-interacting nanoparticle assemblies within the chains, canbe evidenced from MFM and SQUID measurements.
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