Nonlinear conjugate gradient methods in micromagnetics [PDF]
AIP Advances, 2017 Conjugate gradient methods for energy minimization in micromagnetics are compared. The comparison of analytic results with numerical simulation shows that standard conjugate gradient method may fail to produce correct results. A method that restricts the
Dieter Suess +2 more
exaly +3 more sources
Virtual Micromagnetics: A Framework for Accessible and Reproducible Micromagnetic Simulation [PDF]
Journal of Open Research Software, 2016 Computational micromagnetics requires numerical solution of partial differential equations to resolve complex interactions in magnetic nanomaterials. The Virtual Micromagnetics project described here provides virtual machine simulation environments to ...
Mark Vousden +3 more
doaj +6 more sources
Experimental approaches for micromagnetic coercivity analysis of advanced permanent magnet materials [PDF]
Science and Technology of Advanced Materials, 2021 Although coercivity is one of the fundamental properties of permanent magnets, it has not been well understood. In this paper, micromagnetics and thermal activation magnetization reversal theories are briefly reviewed, and then our recent macroscopic and
Satoshi Okamoto
doaj +2 more sources
Variational Principles of Micromagnetics Revisited [PDF]
SIAM Journal on Mathematical Analysis, 2019 We revisit the basic variational formulation of the minimization problem associated with the micromagnetic energy, with an emphasis on the treatment of the stray field contribution to the energy, which is intrinsically non-local.
G. Fratta +3 more
semanticscholar +7 more sources
Micromagnetic Investigation on Microstructure Modulation and Magnetic Properties of Nd-Fe-B Permanent Magnets [PDF]
NanomaterialsThe magnetic properties of materials similar to Nd-Fe-B permanent magnets are highly sensitive to microstructure. Using Hybrid Monte Carlo micromagnetics simulations, we systematically investigate how grain boundary (GB) and grain crystallographic ...
Lingbo Bao +7 more
doaj +2 more sources
Advanced Modeling and Simulation of Multilayer Spin–Transfer Torque Magnetoresistive Random Access Memory with Interface Exchange Coupling [PDF]
MicromachinesIn advancing the study of magnetization dynamics in STT-MRAM devices, we employ the spin drift–diffusion model to address the back-hopping effect. This issue manifests as unwanted switching either in the composite free layer or in the reference layer in ...
Mario Bendra +4 more
doaj +2 more sources
Large-scale micromagnetics simulations with dipolar interaction using all-to-all communications
AIP Advances, 2016 We implement on our micromagnetics simulator low-complexity parallel fast-Fourier-transform algorithms, which reduces the frequency of all-to-all communications from six to two times.
Hiroshi Tsukahara +8 more
doaj +2 more sources
A self-consistent spin-diffusion model for micromagnetics [PDF]
Scientific Reports, 2016 We propose a three-dimensional micromagnetic model that dynamically solves the Landau-Lifshitz-Gilbert equation coupled to the full spin-diffusion equation.
Claas Abert +6 more
doaj +2 more sources
Field-Driven Magnetic Phase Diagram and Vortex Stability in Fe Nanometric Square Prisms [PDF]
Nanomaterials, 2022 In this work, we deal with the zero temperature hysteretic properties of iron (Fe) quadrangular nanoprisms and the size conditions underlying magnetic vortex states formation.
Mauricio Galvis +2 more
doaj +2 more sources
IUCrJ, 2020 Small-angle scattering of X-rays and neutrons is a routine method for the determination of nanoparticle sizes. The so-called Guinier law represents the low-q approximation for the small-angle scattering curve from an assembly of particles.
Andreas Michels +6 more
doaj +2 more sources