Patterned Nanomagnetic Films

Abstract

Nano-fabrication technologies for patterned structures made from thin films are reviewed. A classification is made to divide the patterning technologies in two groups namely with and without the using a mask. The more traditional methods as well as a few new methods are discussed al in relation with the application. As mask less methods we discussed direct patterning with ions including FIB, nanopaterning with electron beams, interferometric laser annealing and ion beam induced chemical vapor deposition. The methods using masks are ion irradiation and projection, interference lithography, the use of pre-etched substrates and templates from diblock copolymers and imprint technologies. Also a few remarks are given concerning the magnetic properties of patterned films. Nanometer scale magnetic entities (nanoelements, nanodots, nanomagnets) form a fast growing new area of solid-state physics including the new fields of applications. Two of them are summarized namely media for ultra high-density recording and magnetic logic devices.

Direct-Write Ion Beam Lithography

“…Patterned media, magnetic random access memories, spin electronic devices, and developing magnetic logic and magnetooptical devices are the main examples of lithographically produced structures. The top-down fabrication techniques capable of producing patterned magnetic nanostructures were reviewed by Lodder [103], and especially FIB-based fabrication was reviewed by Khizroev and Litvinov [104]. The latter article points out that although IBL technology is mostly limited to rapid prototyping (i.e., R&D) type of applications in industry, it is a strongly beneficial choice in this role.…”

The relativistic effect of critical temperature reduction in the two dimensional Ising model

“…Magnetic systems are of particular interest for the potential of biomedical applications in magnetic hyperthermia and for the construction of new technological devices such as: magnetic memories, nano-antennas, magnetic tunneling junctions, etc. [1][2][3][4][5][6][7][8] The Ising model is a prototype model, proposed to provide an explanation of the phase transition of a magnetic system. The Ising model consists of spins, subjected to shortrange interactions, spread over the sites of a two-dimensional network.…”

Nanopatterning of magnetic domains: Fe coverage of self-assembled alumina nanostructure

“…1) Many lithographic approaches and bottom-up self-assembly methods have been reported. [1][2][3][4][5][6][7][8][9][10] However, in the regime of ultrathin films that are several monolayers thick, magnetic nanostructures at room temperature are seldom reported. 11,12) Here we propose a method of in situ preparation of ultrathin films with magnetic nanopatterns at room temperature in which the pattern size can be tuned from tens of nanometers to larger than a micrometer.…”