Ferromagnetic Co-C nanodot arrays produced by direct interferometric laser annealing

Abstract

Polushkin, Nikolay; and Salashchenko, N.N., "Ferromagnetic Co-C nanodot arrays produced by direct interferometric laser annealing" (2001 Abstract-Magnetic properties of Co-C nanodot arrays produced by direct interferometric laser annealing are investigated by magnetic force microscopy (MFM) and magnetization measurements. The dots are formed by locally annealing sputtered amorphous Co-C films in regions where the laser intensity is highest. As-sputtered Co-C films do not exhibit ferromagnetic order at room temperature, but MFM shows that the dots become magnetic upon annealing, possibly due to the agglomeration or phase separation of Co-rich clusters. The dots are embedded in either a paramagnetic or weakly magnetic matrix. The magnetic properties of the generated pattern can be changed by varying the laser power. The present results show that direct interferometric lithography may become a useful tool for fabricating future patterned magnetic nanostructures.Index Terms-Artificially structured materials-small particles and patterned films, magnetic domains.

Magnetic nanodot arrays produced by direct laser interference lithography

“…In addition, one might ask whether the regions between the dots are magnetic based on the low in-plane coercive field. In fact, we have shown that increasing the laser power leads to a more homogeneously magnetized film, 19 but the present work is in a regime below this threshold. The low H c value is compatible with domain-wall motion but comparing the dot diameter ͑about 250 nm͒ with the Bloch-wall width of Co ͑14 nm͒ suggests that the wall motion may well be confined to a single dot.…”

Synthesis and characterization of self organized SiO2 nano pillar with MnO as the magnetic tip.

“…The synthesis of magnetic nanodots either in matrix or onto substrate has been an interesting subject because of increasing demand of magnetic recording media and magnetic devices (1,2). Several groups have fabricated magnetic nanodots (3)(4)(5) and many methods have been adopted to fabricate nanodots arrays such as, ion beam (6) or indirect (7-9) lithography and interferometric laser (10,11). Ferromagnetic nanodots arrays have been investigated by numbers of researchers.…”

Magnetic surface patterns made by non-destructive laser interference

“…Conventional laser interference lithography is a multi-step process, involving the interference of several laser beams, use of photoresist, etching and subsequent cleaning when applying it to pattern magnetic structures [2,5]. Moreover, in the preparation of the film process using interference lithography, what the related factors with the magnetic properties of thin films, and how to obtain the micro/nano-structure and excellent magnetic properties of thin films will lay a good foundation for the preparation and study of magnetic film devices.…”