Fe nanomagnets with unusual size-dependent magnetization directions produced by fast laser-induced self-organization

H. Krishna; N. Shirato; A. K. Gangopadhyay; R. Kalyanaraman

doi:10.1117/12.795171

9 September 2008 Fe nanomagnets with unusual size-dependent magnetization directions produced by fast laser-induced self-organization

H. Krishna, N. Shirato, A. K. Gangopadhyay, R. Kalyanaraman

Author Affiliations +

Proceedings Volume 7039, Nanoengineering: Fabrication, Properties, Optics, and Devices V; 703909 (2008) https://doi.org/10.1117/12.795171
Event: NanoScience + Engineering, 2008, San Diego, California, United States

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.

Citation Download Citation

H. Krishna, N. Shirato, A. K. Gangopadhyay, and 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); https://doi.org/10.1117/12.795171

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