Ferromagnetic hysteresis and structural recrystallization in turbostratic graphite

2019 ◽  
Vol 6 (10) ◽  
pp. 105612 ◽  
Author(s):  
Mahsa Fayazi ◽  
Bingyan Liu ◽  
Li Lei ◽  
Gao Shuai ◽  
Omololu Odunmbaku ◽  
...  
Keyword(s):  
Ferromagnetic Hysteresis ◽  
Structural Recrystallization

scholarly journals Magnetization of Ultraviolet-Reduced Graphene Oxide Flakes in Composites Based on Polystyrene

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2519
Author(s):  
Alexander N. Ionov ◽  
Mikhail P. Volkov ◽  
Marianna N. Nikolaeva ◽  
Ruslan Y. Smyslov ◽  
Alexander N. Bugrov
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reduction Process ◽  
X Ray Diffraction ◽  
Mesoscopic Structure ◽  
Reduced Graphene ◽  
Study Results ◽  
Edge Defects ◽  
Mesoscopic Level ◽  
Ferromagnetic Hysteresis

This work presents our study results of the magnetization of multilayer UV-reduced graphene oxide (UV-rGO), polymer matrix (polystyrene), and a conjugated composite based on them. The mesoscopic structure of the composites synthesized in this work was studied by such methods as X-ray diffraction, SEM, as well as NMR-, IR- and Raman spectroscopy. The magnetization of the composites under investigation and their components was measured using a vibrating-sample magnetometer. It has been shown that the UV-reduction process leads to the formation of many submicron holes distributed inside rGO flakes, which can create edge defects, causing possibly magnetic order in the graphite samples under investigation on the mesoscopic level. This article provides an alternative explanation for the ferromagnetic hysteresis loop in UV-rGO on the base of superconductivity type-II.

Weak ferromagnetic response in PbZr1−xTixO3 single crystals

2019 ◽  
Vol 7 (36) ◽  
pp. 11085-11089
Author(s):  
Iwona Lazar ◽  
Monika Oboz ◽  
Jerzy Kubacki ◽  
Andrzej Majchrowski ◽  
Julita Piecha ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Single Crystals ◽  
Room Temperature ◽  
Ferromagnetic Hysteresis ◽  
First Time ◽  
Ferromagnetic Hysteresis Loop ◽  
Weak Ferromagnetic

For the first time, a weak ferromagnetic hysteresis loop at room temperature has been observed in PbZr1−xTixO3 (PZT) single crystals.

Domain cooperation in ferromagnetic hysteresis

2001 ◽  
Vol 89 (2) ◽  
pp. 1281-1286 ◽  
Author(s):  
Carl S. Schneider
Keyword(s):  
Ferromagnetic Hysteresis

Energy-Consistent Finite Element Modelling of Ferromagnetic Hysteresis

2012 ◽  
Author(s):  
Christophe Geuzaine ◽  
Laurent Stainier ◽  
Francois Henrotte
Keyword(s):  
Finite Element ◽  
Magnetic Energy ◽  
Kinematic Hardening ◽  
Hysteresis Loops ◽  
Macroscopic Model ◽  
Dissipated Energy ◽  
Internal Variables ◽  
Incremental Formulation ◽  
Ferromagnetic Hysteresis ◽  
Electromagnetic Models

In this article we propose a macroscopic model for ferromagnetic hysteresis that is well-suited for finite element implementation. The model is readily vectorial and relies on a consistent thermodynamic formulation. In particular, the stored magnetic energy and the dissipated energy are known at all times, and not solely after the completion of closed hysteresis loops as is usually the case. The obtained incremental formulation is variationally consistent, i.e., all internal variables follow from the minimization of a thermodynamic potential. This variational approach is directly inspired from the kinematic hardening theory of plasticity, which opens the door for novel energy-consistent coupled mechanical/electromagnetic models.

Recrystallization Mechanisms in Severely Deformed Dual-Phase Stainless Steel

2010 ◽  
Vol 638-642 ◽  
pp. 1905-1910 ◽  
Author(s):  
Andrey Belyakov ◽  
Rustam Kaibyshev ◽  
Yuuji Kimura ◽  
Kaneaki Tsuzaki
Keyword(s):  
Stainless Steel ◽  
Large Strain ◽  
Austenite Phase ◽  
The Other ◽  
Dual Phase ◽  
Austenite Stainless Steel ◽  
Ultrafine Grained ◽  
Continuous Recrystallization ◽  
Ultrafine Grained Microstructure ◽  
Structural Recrystallization

The structural recrystallization mechanisms operating in an Fe – 27%Cr – 9% Ni dual-phase (ferrite-austenite) stainless steel after large strain processing to total strain of 4.4 were investigated in the temperature range of 400-700oC. The severe deformation resulted in the development of an ultrafine grained microstructure consisting of highly elongated grains/subgrains with transverse dimensions of 160 nm and 130 nm in ferrite and austenite, respectively. The annealing mechanism operating in ferrite phase was considered as continuous recrystallization, which involved recovery leading to the development of essentially polygonized microstructure. On the other hand, the mechanism of discontinuous nucleation took place at an early recrystallization stage in austenite phase.

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