Magnetization Reversal in Ferromagnetic Thin Films

2011 ◽  
Vol 399-401 ◽  
pp. 890-895
Author(s):  
Jia Li Sun ◽  
Jing Guo Hu
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetization Reversal ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Ferromagnetic Film ◽  
Magnetic Films ◽  
Ferromagnetic Thin Films ◽  
Interface Coupling ◽  
Domain Structures ◽  
Reversal Mechanism

The magnetization reversal mechanism of the magnetic films system with the different magnetic anisotropy, exchange coupling, interface coupling, etc. has been simulated by Monte-Carlo method. The results show that the decrease of magnetic anisotropy is in favor of motion of domain walls, but is not conducive to consistent rotation. The interface coupling of both the ferromagnetic film and the antiferromagnetic film are helpful to the motion of domain walls while the antiferromagnetic film coupling is the more effective. Meantime, the evolution of the microscopic magnetic domain structures has been inspected intuitively while the system is in the process of magnetization.

Temperature Dependence of Magnetic Domains and Wall Structures

1972 ◽  
Vol 30 ◽  
pp. 496-497
Author(s):  
Sonoko Tsukahara ◽  
Tadami Taoka ◽  
Hisao Nishizawa
Keyword(s):  
Temperature Dependence ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Iron Film ◽  
Objective Lens ◽  
Lorentz Microscopy ◽  
Domain Structures ◽  
Wall Structures ◽  
Crystal Films ◽  
Metallurgical Structure

The high voltage Lorentz microscopy was successfully used to observe changes with temperature; of domain structures and metallurgical structures in an iron film set on the hot stage combined with a goniometer. The microscope used was the JEM-1000 EM which was operated with the objective lens current cut off to eliminate the magnetic field in the specimen position. Single crystal films with an (001) plane were prepared by the epitaxial growth of evaporated iron on a cleaved (001) plane of a rocksalt substrate. They had a uniform thickness from 1000 to 7000 Å.The figure shows the temperature dependence of magnetic domain structure with its corresponding deflection pattern and metallurgical structure observed in a 4500 Å iron film. In general, with increase of temperature, the straight domain walls decrease in their width (at 400°C), curve in an iregular shape (600°C) and then vanish (790°C). The ripple structures with cross-tie walls are observed below the Curie temperature.

scholarly journals Magnetic properties of (Bi1−xLax)(Fe,Co)O3 films fabricated by a pulsed DC reactive sputtering and demonstration of magnetization reversal by electric field

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Munusamy Kuppan ◽  
Daichi Yamamoto ◽  
Genta Egawa ◽  
Sivaperuman Kalainathan ◽  
Satoru Yoshimura
Keyword(s):  
Electric Field ◽  
Magnetization Reversal ◽  
High Performance ◽  
Magnetic Domain ◽  
Magnetic Film ◽  
Film Plane ◽  
Force Microscopy ◽  
Domain Structures ◽  
Pulsed Dc ◽  
Submicron Scale

Abstract(Bi1−xLax)(Fe,Co)O3 multiferroic magnetic film were fabricated using pulsed DC (direct current) sputtering technique and demonstrated magnetization reversal by applied electric field. The fabricated (Bi0.41La0.59)(Fe0.75Co0.25)O3 films exhibited hysteresis curves of both ferromagnetic and ferroelectric behavior. The saturated magnetization (Ms) of the multiferroic film was about 70 emu/cm3. The squareness (S) (= remanent magnetization (Mr)/Ms) and coercivity (Hc) of perpendicular to film plane are 0.64 and 4.2 kOe which are larger compared with films in parallel to film plane of 0.5 and 2.5 kOe. The electric and magnetic domain structures of the (Bi0.41La0.59)(Fe0.75Co0.25)O3 film analyzed by electric force microscopy (EFM) and magnetic force microscopy (MFM) were clearly induced with submicron scale by applying a local electric field. This magnetization reversal indicates the future realization of high performance magnetic device with low power consumption.

Structure and magnetization reversal mechanism in L10 FePt films with perpendicular magnetic anisotropy

2012 ◽  
Vol 520 (17) ◽  
pp. 5746-5751 ◽  
Author(s):  
S.J. Zhang ◽  
Jian-Guo Zheng ◽  
Z. Shi ◽  
S.M. Zhou ◽  
L. Sun ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetization Reversal ◽  
Perpendicular Magnetic Anisotropy ◽  
Reversal Mechanism

Thermal-Driven Evolution of Magnetic Domain Structures in Ultrathin Films

2006 ◽  
Vol 112 ◽  
pp. 101-108 ◽  
Author(s):  
V. Zablotskii ◽  
Andrzej Maziewski ◽  
T. Polyakova
Keyword(s):  
Ultrathin Films ◽  
Characteristic Length ◽  
Magnetic Domain ◽  
Magnetic Films ◽  
Spin Reorientation ◽  
Stripe Domain ◽  
Domain Structures ◽  
Increasing Temperature ◽  
Domain Period ◽  
Key Parameter

The thermal-driven evolution of stripe domain structures in ultrathin magnetic films is analyzed with regard to temperature dependencies of the film magnetic parameters. In the vicinity of the Curie temperature or points of the spin reorientation the equilibrium stripe domain period was found to exponentially decrease with increasing temperature. It is shown that the temperature dependence of the characteristic length is the key parameter controlling the domain period changes. Irreversible and reversible changes of the domain period as well as the so-called inverse domain melting are discussed.

scholarly journals Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures

2015 ◽  
Vol 92 (5) ◽  
Author(s):  
Arianna Casiraghi ◽  
Teresa Rincón Domínguez ◽  
Stefan Rößler ◽  
Kévin J. A. Franke ◽  
Diego López González ◽  
...  
Keyword(s):  
Magnetization Reversal ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Magnetic Domain Walls ◽  
Multiferroic Heterostructures

Atomic Structure-Sensitive Magnetic Domain Structures of Thin Films

1985 ◽  
Vol 43 ◽  
pp. 206-209
Author(s):  
S. Tsukahara
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Quarter Century ◽  
Specimen Handling ◽  
Lorentz Microscopy ◽  
Domain Structures ◽  
Structure Sensitive ◽  
Direct Interpretation

Transmission electron microscopy, TEM, that can serve for observation of both atomic and magnetic structures is useful to investigate structure sensitive magnetic properties. It is most effective when it is applied to thin films for which direct interpretation of the results is possible without considering additional effects through specimen handling for TEM use and modification of dimension dependent magnetic properties.Transmission Lorentz microscopy, TLM, to observe magnetic domains has been known for a quarter century. Among TLM modes the defocused mode has been most popular due to its simple way of operation. Recent development of TEM made it possible that an average instrument commercially available could be easily operated at any TLM modes to produce high quality images. This paper mainly utilizes the Foucault mode to investigate domain walls and magnetization ripples as the finest details of domain structure.

scholarly journals One-dimensional magnetic domain walls

2004 ◽  
Vol 15 (4) ◽  
pp. 451-486 ◽  
Author(s):  
CARLOS J. GARCÍA-CERVERA
Keyword(s):  
Domain Walls ◽  
Characteristic Length ◽  
Magnetic Domain ◽  
Ferromagnetic Materials ◽  
The Self ◽  
One Dimensional ◽  
Ferromagnetic Thin Films ◽  
Energy Scaling ◽  
Magnetic Domain Walls ◽  
Nonlocal Nature

Ferromagnetic materials may present a complicated domain structure, due in part to the nonlocal nature of the self interactions. In this article we present a detailed study of the structure of one-dimensional magnetic domain walls in uniaxial ferromagnetic materials, and in particular, of the Néel and Bloch walls. We analyze the logarithmic tail of the Néel wall, and identify the characteristic length scales in both the Néel and Bloch walls. This analysis is used to obtain the optimal energy scaling for the Néel and Bloch walls. Our results are illustrated with numerical simulations of one-dimensional walls. A new model for the study of ferromagnetic thin films is presented.

Magnetic domain walls in nanostrips of single-crystalline Fe4N(001) thin films with fourfold in-plane magnetic anisotropy

2017 ◽  
Vol 121 (24) ◽  
pp. 243904 ◽  
Author(s):  
Keita Ito ◽  
Nicolas Rougemaille ◽  
Stefania Pizzini ◽  
Syuta Honda ◽  
Norio Ota ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Single Crystalline ◽  
Magnetic Domain Walls
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