Study on the Magnetization Reversal Behaviors of Pt/Co/Pt Films Depending on the Direction of the External Magnetic Field

2021 ◽  
Vol 71 (1) ◽  
pp. 6-10
Author(s):  
Hak-Su KIM ◽  
Kwang-Su RYU*
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetization Reversal ◽  
Pt Films

scholarly journals Влияние магнитомягкой фазы на процессы перемагничивания магнитотвердого/магнитомягкого бислоя

2020 ◽  
Vol 62 (6) ◽  
pp. 846
Author(s):  
Т.А. Тааев ◽  
К.Ш. Хизриев ◽  
А.К. Муртазаев
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
External Magnetic Field ◽  
Exchange Interaction ◽  
Magnetization Reversal ◽  
Magnetic Layer ◽  
Anisotropy Constant ◽  
Soft Magnetic ◽  
The Monte Carlo Method

Investigation of the magnetization reversal of a hard/soft magnetic bilayer in an external magnetic field was performed by the Monte Carlo method. The magnetization reversal curves of the magnetic bilayer are plotted for various values of the thickness of the soft magnetic layer. Also the effect of the intralayer exchange interaction and the anisotropy constant on the magnetization reversal processes was studied. The phase diagrams of the magnetic bilayer are plotted.

scholarly journals Режимы взаимодействия намагниченных стопок ВТСП-лент

2022 ◽  
Vol 64 (2) ◽  
pp. 167
Author(s):  
А.И. Подливаев ◽  
И.А. Руднев
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetization Reversal ◽  
Critical State ◽  
Second Generation ◽  
Interaction Force ◽  
Critical State Model ◽  
State Model ◽  
Multiple Cycles

On the basis of the critical state model, the interaction force of a pair of magnetic lines, which are sets of magnetized stacks of second-generation HTSC tapes, is calculated. The modes of magnetization of interacting rulers by an external magnetic field and the origin of the magnetization reversal of the stacks of tapes during multiple cycles of approaching - moving the rulers away from each other are considered. The force of interaction of the rulers is determined depending on the distance between them and the number of the cycle.

scholarly journals Magnetization Reversal in Concave Iron Nano-Superellipses

2021 ◽  
Vol 6 (2) ◽  
pp. 17
Author(s):  
Emre Öncü ◽  
Andrea Ehrmann
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetization Reversal ◽  
Hysteresis Loops ◽  
Strong Impact ◽  
Research Groups ◽  
Micromagnetic Simulations ◽  
Magnetic Nanodots ◽  
Reversal Process ◽  
Magnetization Reversal Process

Square magnetic nanodots can show intentional or undesired shape modifications, resulting in superellipses with concave or convex edges. Some research groups also concentrated on experimentally investigating or simulating concave nano-superellipses, sometimes called magnetic astroids due to their similarity to the mathematical shape of an astroid. Due to the strong impact of shape anisotropy in nanostructures, the magnetization-reversal process including coercive and reversibility fields can be expected to be different in concave or convex superellipses than that in common squares. Here, we present angle-dependent micromagnetic simulations on magnetic nanodots with the shape of concave superellipses. While magnetization reversal occurs via meander states, horseshoe states or the 180° rotation of magnetization for the perfect square, depending on the angle of the external magnetic field, more complicated states occur for superellipses with strong concaveness. Even apparently asymmetric hysteresis loops can be found along the hard magnetization directions, which can be attributed to measuring minor loops since the reversibility fields become much larger than the coercive fields.

Magnetization reversal in crossed double elliptic permalloy nanodisks studied by micromagnetic simulation

2018 ◽  
Vol 32 (13) ◽  
pp. 1850156
Author(s):  
Amaresh Chandra Mishra ◽  
R. Giri
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Applied Magnetic Field ◽  
Magnetization Reversal ◽  
Major Axis ◽  
Vortex State ◽  
Micromagnetic Simulation ◽  
Minor Axis ◽  
Semi Major Axis ◽  
Saturation State

The remanent state of elliptical permalloy nanodisks depends on the orientation of the applied magnetic field with respect to the major and minor axes of the nanodisks [A. C. Mishra, Int. J. Mod. Phys. B 30, 1650192 (2016)]. The remanent state is usually an onion state if the external magnetic field is along the major axis, and is a vortex state if the external magnetic field is along the minor axis. In this work, we have analyzed the magnetization reversal of a crossed elliptic disk of permalloy using micromagnetic simulation. This is a new shape where two identical elliptic disks with semi-major axis of length a and semi-minor axis of length b intersect such that they are perpendicular to each other. If the value of b is very close to that of a, then the remanent state is a near saturation state. As the ratio a/b goes down, new complex remanent states are observed. The hysteresis loss is found to be decreased gradually with the increment of b for a given value of b.

scholarly journals Magnetization Reversal in Ferromagnetic Nanorings of Fourfold Symmetries

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Andrea Ehrmann ◽  
Tomasz Blachowicz
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetization Reversal ◽  
Domain Walls ◽  
Memory Devices ◽  
Micromagnetic Simulations ◽  
Stable Intermediate ◽  
Intermediate States ◽  
The Stability ◽  
Ferromagnetic Nanorings

Magnetic nanoparticles offer a broad spectrum of magnetization reversal processes and respective magnetic states, such as onion, horseshoe, or vortex states as well as various states including domain walls. These states can be correlated with stable intermediate states at remanence, enabling new quaternary memory devices storing two bits in one particle. The stability of these intermediated states was tested with respect to shape modifications, variations in the anisotropy axes, and rotations and fluctuations of the external magnetic field. In our micromagnetic simulations, 6 different stable intermediate states were observed at vanishing magnetic field in addition to the remanence state. The angular region of approx. 5°–12° between nanoring and external magnetic field was identified as being most stable with respect to all modifications, with an onion state as technologically best accessible intermediate state to create quaternary memory devices.

Micromagnetic Simulation of CoFe Magnetic Nanorings: Switching Behavior in External Magnetic Field

2013 ◽  
Vol 710 ◽  
pp. 80-84 ◽  
Author(s):  
Zhen Gang Guo ◽  
Li Qing Pan ◽  
Hong Mei Qiu ◽  
M. Yasir Rafique ◽  
Shuai Zeng
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetization Reversal ◽  
Domain Walls ◽  
Vortex State ◽  
Switching Behavior ◽  
Switching Field ◽  
Reversal Process ◽  
Magnetic States ◽  
Magnetization Processes

The magnetization reversal processes of magnetic nanorings (Co50Fe50) with different geometric shapes are investigated. In addition to the expected onion and vortex magnetization states, other metastable states are observed in the magnetization processes. We anatomize the formation and transition of magnetic states, and the propagation and annihilation of domain walls in the reversal process through the dynamic picture. Phase diagrams for the magnetization switching behavior depending on the geometric parameters are presented. The simulation shows that the vortex state is stabilized in thick and narrow rings. The switching field from vortex to onion states turns out to increase with thickness and decrease with width and diameter.

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