A micromagnetic study of the reversal mechanism in permalloy antidot arrays

Abstract

Spin-transfer-torque switching in spin valve structures with perpendicular, canted, and in-plane magnetic anisotropies J. Appl. Phys. 111, 07C913 (2012) Micromagnetic analysis of the magnetization dynamics driven by the Oersted field in permalloy nanorings J. Appl. Phys. 111, 07D103 (2012) Magnetization states and switching in narrow-gapped ferromagnetic nanorings AIP Advances 2, 012136 (2012) Normal modes of coupled vortex gyration in two spatially separated magnetic nanodisks J. Appl. Phys. 110, 113903 (2011) Coercivity control in finite arrays of magnetic particles J. Appl. Phys. 110, 103908 (2011) Additional information on J. Appl. Phys. A numerical analysis is focused on the influence of patterning and finite-size effects on the hysteresis properties and magnetization reversal of permalloy antidot films with square lattice and square holes. Simulations are performed by solving the Landau-Lifshitz equation. The aim is to explain the relationships between the shape of the hysteresis loop and the different stages of the reversal process. In particular, the switching mechanism is characterized by the nucleation of domain chains that destroy the periodic symmetry in the magnetization present when infinite periodicity is considered. This behavior is strongly influenced by the demagnetizing effects arising both at the film boundaries and at the hole edges. V C 2012 American Institute of Physics.

Tailoring of Perpendicular Magnetic Anisotropy in Dy13Fe87 Thin Films with Hexagonal Antidot Lattice Nanostructure

“…This can overcome any kind of intrinsic anisotropy of the host materials, moreover it prefers an OOP orientation of the magnetization [ 24 ]. In addition, theoretical studies about the magnetic anisotropy of antidot arrays performed by Monte Carlo [ 25 ] and in micro-magnetic simulations [ 26 ] illustrate that the INP preferred orientation of the magnetization in a thin film of antidots array can be, at least partially, lifted. Furthermore, the magnetic surface anisotropy contributes to the partial OOP magnetization found here [ 27 ].…”

Combined first-order reversal curve and x-ray microscopy investigation of magnetization reversal mechanisms in hexagonal antidot lattices

“…In the past, several approaches have been pursued to achieve this. Micromagnetic simulation found widespread use and indicated complex intermediate magnetization patterns during magnetization reversal [18][19][20][21]. On the other hand, microscopic investigations have been conducted by others using magneto-optical Kerr effect (MOKE) measurements [22] and photoelectron emission microscopy (PEEM) [16,23] using x-ray magnetic circular dichroism (XMCD) as contrast mechanism.…”

Influence of lattice defects on the ferromagnetic resonance behaviour of 2D magnonic crystals

“…The recent advances in nanofabrication techniques have given a boost to the study of artificially patterned magnetic films for future applications in high density magnetic storage, sensor technology and magneto-logic devices. Attention has been focused on magnetic antidot arrays (magnetic thin films with periodic non-magnetic inclusions or embedded holes), whose hysteresis, anisotropy, magnetization reversal and magnetotransport behaviour can be engineered by properly varying the hole arrangement 1 2 3 4 . The introduction of local shape anisotropies makes these systems interesting also for magnetization dynamics and spin wave propagation properties, which can be exploited for the design of magnonic-crystal waveguides, spin wave emitters, nanoscale microwave filters and frequency-based magnetic nanoparticle detectors 5 6 7 8 9 .…”