Abstract
A two-dimensional Ising square lattice is modeled as a nano-size block array to study by Monte Carlo simulation the magnetic thermal stability of nano-structure magnetic media for data storage, thereon in the blocks J1 > 0 is assigned for the interaction of a pair of nearest-neighbor spins, while 0 J0 J1 for that in regions between the blocks and (J0 + J1)/2 for the nearest-neighbor pairs with one in the block and the other one out of but near-most the block. We show that the magnetic thermal stability of the block accrues with the increase of J1 and with the decrease of J1 - J0 for a given J1, but contrarily, the anchoring ability for the initial magnetic orientation in nano-size block trails off as J1 - J0 diminish. This phenomena and size dependence of such anchoring ability are discussed in detail.
Highlights
IntroductionThe particles must further close up when continuing to heighten the density of magnetic recording, here the interaction between particles is not taken as that of giant magnetic moments
Magnetic microstructure and nano-structure related to high-density magnetic recording, such as magnetic nanowires, chains, rings, planar arrays of magnetic nanoparticles and magnetic nano-structure thin film [1,2,3], is a topic of active research in material science
We show that the magnetic thermal stability of the block accrues with the increase of J1 and with the decrease of J1 − J0 for a given J1, but contrarily, the anchoring ability for the initial magnetic orientation in nano-size block trails off as J1 − J0 diminish
Summary
The particles must further close up when continuing to heighten the density of magnetic recording, here the interaction between particles is not taken as that of giant magnetic moments. The interaction between two particles comes from the nearest-neighbor spin-spin interaction of atoms/ions respectively in their outer layers. If consider the influence of the atoms of substrate materials the correlation of two particles, based on the view of nearest-neighbor interaction, results from the interaction of their outer atoms with the atoms of substrate materials insulating them
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