The Size and Temperature Effects of Coercivity for the Magnetic Nanowire: Monte Carlo Simulation

Abstract

Based on Monte Carlo simulation we study the coercivity of iron nanowire deposited in chemically widened anodic aluminum oxide films. The coercivity is found to depend on the diameter and aspect ratio of the nanowire, and it decreases with increasing nanowire diameter, which is consistent with the experimental result. Two kinds of discretization cells regular global-shaped and regular cubic-shaped are used as minimum element. The simulation result reveals that the regular global-shaped discretization cell allows for more accurate calculated result while comparing to the experimental result than the cubic-shaped discretization cell does. The simulated coercivity as a function of temperature with different diameters shows that the data can be described well by the T-c power-law, and the diameter dependence of the exponent c displays a maximum peak.

Synthesis of Individually Tuned Nanomagnets for Nanomagnet Logic by Direct Write Focused Electron Beam Induced Deposition

“…With this conventional multistep process the desired material is deposited as a blanket layer of homogeneous thickness on the electron beam processed resist, so that the magnetic film will uniformly cover the whole substrate leading to nanoelements with same height. FEBID presents the advantage to precisely tailor the coercivity of individual magnetic NWs by means of their height . This is of decisive relevance in NML for controlling their magnetic reversal to set the proper Boolean value, encoded in one of the two possible magnetic configurations.…”

“…FEBID presents the advantage to precisely tailor the coercivity of individual magnetic NWs by means of their height. 36 This is of decisive relevance in NML for controlling their magnetic reversal to set the proper Boolean value, encoded in one of the two possible magnetic configurations.…”

Study of Magnetic Properties for Fe Nanoring with Different Degree of Eccentricity

“…K is the magnetocrystalline anisotropy constant; ν 0 is the volume of the discretization cell. For Fe nanorings, some typical magnetic data were used in the simulation, such as A=1.51×10 -11 J/m，M S =1.7×10 6 A/m，K=4.8×10 4 J/m 3 [16]. We use Monte Carlo (MC) combined with fast Fourier transformation and micro magnetism (FFTM) method [17][18] to analyze the magnetization reversal processes for various nanorings dimensions, where the spins are free to rotate in three dimensions.…”