9 September 2008 Fe nanomagnets with unusual size-dependent magnetization directions produced by fast laser-induced self-organization
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Abstract
Laser-induced melting of ultrathin films can lead to self-organized arrays of hemispherical particles. We have applied this procedure to assemble arrays of Fe nanomagnets on SiO2 substrates. Morphological studies showed presence of spatial short range order (SRO) in the array. Magnetic properties were studied at room temperature using zero-field magnetic force microscopy (MFM). The particles upto 55 nm in diameter showed in-plane (≤ 45°), compared to out-of-plane magnetization directions (≥ 45°) for the larger particles. The size-dependent orientation of magnetization for these hemispherical particles, was attributed to the dominating magnetostrictive energy and a size-dependent residual strain.
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H. Krishna, N. Shirato, A. K. Gangopadhyay, R. Kalyanaraman, "Fe nanomagnets with unusual size-dependent magnetization directions produced by fast laser-induced self-organization", Proc. SPIE 7039, Nanoengineering: Fabrication, Properties, Optics, and Devices V, 703909 (9 September 2008); doi: 10.1117/12.795171; https://doi.org/10.1117/12.795171
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