High Coercive Field and Magnetization Reversal in Core–Shell Cum Nanotwin Driven Ni/NiO Nanospheres

2011 ◽  
Vol 11 (3) ◽  
pp. 2632-2635
Author(s):  
Gunadhor S. Okram ◽  
Ajay Soni ◽  
D. T. Adroja ◽  
N. P. Lalla ◽  
T. Shripathi
Keyword(s):  
Magnetization Reversal ◽  
Coercive Field ◽  
Core Shell ◽  
High Coercive Field

scholarly journals Templated grain growth of high coercive field CuO‐doped textured PYN‐PMN‐PT ceramics

2020 ◽  
Vol 103 (11) ◽  
pp. 6149-6156 ◽  
Author(s):  
Michael J. Brova ◽  
Beecher H. Watson ◽  
Rebecca L. Walton ◽  
Elizabeth R. Kupp ◽  
Mark A. Fanton ◽  
...  
Keyword(s):  
Grain Growth ◽  
Coercive Field ◽  
Templated Grain Growth ◽  
High Coercive Field

scholarly journals Processing and electromechanical properties of high‐coercive field ZnO‐doped PIN‐PZN‐PT ceramics

2020 ◽  
Vol 103 (9) ◽  
pp. 4794-4802 ◽  
Author(s):  
Michael J. Brova ◽  
Beecher H. Watson ◽  
Rebecca L. Walton ◽  
Elizabeth R. Kupp ◽  
Mark A. Fanton ◽  
...  
Keyword(s):  
Coercive Field ◽  
Electromechanical Properties ◽  
High Coercive Field

Tuning the coercive field by controlling the magnetization reversal process in permalloy modulated nanowires

2020 ◽  
Vol 512 ◽  
pp. 167045
Author(s):  
Guidobeth Sáez ◽  
Eduardo Cisternas ◽  
Pablo Díaz ◽  
Eugenio E. Vogel ◽  
Juan Pablo Burr ◽  
...  
Keyword(s):  
Magnetization Reversal ◽  
Coercive Field ◽  
Reversal Process ◽  
Magnetization Reversal Process

scholarly journals Nanocompositional Electron Microscopic Analysis and Role of Grain Boundary Phase of Isotropically Oriented Nd-Fe-B Magnets

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Gregor A. Zickler ◽  
Josef Fidler
Keyword(s):  
Domain Wall ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Magnetization Reversal ◽  
Coercive Field ◽  
Microscopic Analysis ◽  
Realistic Model ◽  
Boundary Phase ◽  
Electron Microscopic ◽  
The Impact

Nanoanalytical TEM characterization in combination with finite element micromagnetic modelling clarifies the impact of the grain misalignment and grain boundary nanocomposition on the coercive field and gives guidelines how to improve coercivity in Nd-Fe-B based magnets. The nanoprobe electron energy loss spectroscopy measurements obtained an asymmetric composition profile of the Fe-content across the grain boundary phase in isotropically oriented melt-spun magnets and showed an enrichment of iron up to 60 at% in the Nd-containing grain boundaries close to Nd2Fe14B grain surfaces parallel to the c-axis and a reduced iron content up to 35% close to grain surfaces perpendicular to the c-axis. The numerical micromagnetic simulations on isotropically oriented magnets using realistic model structures from the TEM results reveal a complex magnetization reversal starting at the grain boundary phase and show that the coercive field increases compared to directly coupled grains with no grain boundary phase independently of the grain boundary thickness. This behaviour is contrary to the one in aligned anisotropic magnets, where the coercive field decreases compared to directly coupled grains with an increasing grain boundary thickness, if Js value is > 0.2 T, and the magnetization reversal and expansion of reversed magnetic domains primarily start as Bloch domain wall at grain boundaries at the prismatic planes parallel to the c-axis and secondly as Néel domain wall at the basal planes perpendicular to the c-axis. In summary our study shows an increase of coercive field in isotropically oriented Nd-Fe-B magnets for GB layer thickness > 5 nm and an average Js value of the GB layer < 0.8 T compared to the magnet with perfectly aligned grains.

Oersted field assisted magnetization reversal in cylindrical core-shell nanostructures

2015 ◽  
Vol 117 (17) ◽  
pp. 173914 ◽  
Author(s):  
J. A. Otálora ◽  
D. Cortés-Ortuño ◽  
D. Görlitz ◽  
K. Nielsch ◽  
P. Landeros
Keyword(s):  
Magnetization Reversal ◽  
Core Shell ◽  
Shell Nanostructures

scholarly journals Controlling Magnetization Reversal and Hyperthermia Efficiency in Core–Shell Iron–Iron Oxide Magnetic Nanoparticles by Tuning the Interphase Coupling

2020 ◽  
Vol 3 (5) ◽  
pp. 4465-4476 ◽  
Author(s):  
K. Simeonidis ◽  
C. Martinez-Boubeta ◽  
D. Serantes ◽  
S. Ruta ◽  
O. Chubykalo-Fesenko ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Magnetization Reversal ◽  
Core Shell ◽  
Iron Oxide Magnetic Nanoparticles ◽  
Iron Iron

scholarly journals Magnetization reversal and anomalous dependence of the coercive field with temperature in MnAs epilayers grown on GaAs

2006 ◽  
Vol 74 (14) ◽  
Author(s):  
L. B. Steren ◽  
J. Milano ◽  
V. Garcia ◽  
M. Marangolo ◽  
M. Eddrief ◽  
...  
Keyword(s):  
Magnetization Reversal ◽  
Coercive Field ◽  
Anomalous Dependence

scholarly journals Magnetization Reversal Process and Magnetostatic Interactions in Fe56Co44/SiO2/Fe3O4 Core/Shell Ferromagnetic Nanowires with Non-Magnetic Interlayer

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2282
Author(s):  
Javier García ◽  
Alejandro M. Manterola ◽  
Miguel Méndez ◽  
Jose Angel Fernández-Roldán ◽  
Víctor Vega ◽  
...  
Keyword(s):  
Data Storage ◽  
Magnetization Reversal ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Hysteresis Loops ◽  
Magnetic Data ◽  
Core Shell ◽  
The Core ◽  
Shell Nanostructures ◽  
Magnetostatic Interactions

Nowadays, numerous works regarding nanowires or nanotubes are being published, studying different combinations of materials or geometries with single or multiple layers. However, works, where both nanotube and nanowires are forming complex structures, are scarcer due to the underlying difficulties that their fabrication and characterization entail. Among the specific applications for these nanostructures that can be used in sensing or high-density magnetic data storage devices, there are the fields of photonics or spintronics. To achieve further improvements in these research fields, a complete understanding of the magnetic properties exhibited by these nanostructures is needed, including their magnetization reversal processes and control of the magnetic domain walls. In order to gain a deeper insight into this topic, complex systems are being fabricated by altering their dimensions or composition. In this work, a successful process flow for the additive fabrication of core/shell nanowires arrays is developed. The core/shell nanostructures fabricated here consist of a magnetic nanowire nucleus (Fe56Co44), grown by electrodeposition and coated by a non-magnetic SiO2 layer coaxially surrounded by a magnetic Fe3O4 nanotubular coating both fabricated by means of the Atomic Layer Deposition (ALD) technique. Moreover, the magnetization reversal processes of these coaxial nanostructures and the magnetostatic interactions between the two magnetic components are investigated by means of standard magnetometry and First Order Reversal Curve methodology. From this study, a two-step magnetization reversal of the core/shell bimagnetic nanostructure is inferred, which is also corroborated by the hysteresis loops of individual core/shell nanostructures measured by Kerr effect-based magnetometer.

scholarly journals Isotropic, high coercive field in melt-spun tetragonal Heusler Mn3Ge

APL Materials ◽  
2016 ◽  
Vol 4 (8) ◽  
pp. 086113 ◽  
Author(s):  
Adel Kalache ◽  
Guido Kreiner ◽  
Siham Ouardi ◽  
Susanne Selle ◽  
Christian Patzig ◽  
...  
Keyword(s):  
Coercive Field ◽  
Melt Spun ◽  
High Coercive Field
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