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Articles 1 - 4 of 4
Full-Text Articles in Engineering
Diffusion Process And Formation Of Super-Spin-Glass State In Soft Magnetic Fe/Pt System, D. Aurongzeb, M. Holtz, L. Menon
Diffusion Process And Formation Of Super-Spin-Glass State In Soft Magnetic Fe/Pt System, D. Aurongzeb, M. Holtz, L. Menon
Latika Menon
We report results on surface and micromagnetic structures of Fe thin films consisting of a Pt underlayer. We use atomic force microscopy to study the surface structure evolution of the Fe films as a function of annealing time at an annealing temperature of 800 °C. Power spectral density analysis shows saturation in roughness exponent after 15 min of annealing. However, lateral correlation length and roughness continue to increase for up to 45 min. At high annealing temperature, the authors find two separate phase correlation lengths and a single surface correlation length indicating super-spin-glass state in the system.
Influence Of Surface/Interface Roughness And Grain Size On Magnetic Property Of Fe/Co Bilayer, Deeder Aurongzeb, K. Bhargava Ram, Latika Menon
Influence Of Surface/Interface Roughness And Grain Size On Magnetic Property Of Fe/Co Bilayer, Deeder Aurongzeb, K. Bhargava Ram, Latika Menon
Latika Menon
In this work, we report the influence of surface roughness and cluster size on coercivity of Fe/Co bilayer. Coercivity was tuned by thermal annealing. No systematic trend was found for temperature dependent annealing. However, after annealing at 350 °C, we find systematic increase in coercivity with anneal time. For as-deposited film, we find unusually low coercivity (0.39 Oe). By increasing annealing time, coercivity was tuned to values as high as 600 Oe. Surface characterization using atomic force microscopy showed uniform clusters at this temperature after 2 h of annealing. The observed magnetic properties are discussed in terms of cluster size …
Magnetic Properties Of Gamnas Nanodot Arrays Fabricated Using Porous Alumina Templates, S. P. Bennett, L. Menon, D. Heiman
Magnetic Properties Of Gamnas Nanodot Arrays Fabricated Using Porous Alumina Templates, S. P. Bennett, L. Menon, D. Heiman
Latika Menon
Ordered arrays of GaMnAs magnetic semiconductor nanodots have been fabricated using anodic porous alumina templates as etch masks. The magnetic behavior is studied for prepared arrays with 40 nm dot diameter, 15 nm dot thickness, and 80 nm periodicity. The disklike nanodots exhibit an easy axis for fields applied in the radial direction and a hard axis in the smaller direction. In the radial direction superparamagnetism is observed with a blocking temperature of 30 K. The fabrication technique is convenient for preparing nanodot arrays of compound semiconductors that cannot be formed by self-assembly techniques.
Dendritic-Pattern Formation In Anodic Aluminum Oxide Templates, Adam L. Friedman, Latika Menon
Dendritic-Pattern Formation In Anodic Aluminum Oxide Templates, Adam L. Friedman, Latika Menon
Latika Menon
Formation of disordered and ordered pore patterns in two dimensions have been reported in pore growth in nanoporous alumina templates. This is explained in terms of instability in the pattern formation. Here, we report our observation of instability in the pattern formation in three dimensions, that is, along the cylindrical axis of the pores. The instability is revealed in the form of dendrites in the pore pattern under certain fabrication conditions. We examine the conditions under which two- and three-dimensional instability occurs and compare our observations of the two dimensional case with existing models in the literature.