Exchange-coupling effects in perpendicular composite materials

In this work, we investigated the magnetic anisotropy and the influence of weak exchange interactions on the magnetic relaxations of a triangular type dysprosium single-molecule magnet.

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Preparation and Magnetic Properties of the Core-Nanoshell Composite Materials Doped with Nd

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.284-286.1956 ◽

2011 ◽

Vol 284-286 ◽

pp. 1956-1960

Author(s):

Ru Xin Che ◽

Chun Xia Wang ◽

Bing Yu

Keyword(s):

Magnetic Properties ◽

Composite Materials ◽

Fly Ash ◽

Exchange Coupling ◽

Magnetic Loss ◽

Solid State Reaction Method ◽

X Ray Diffraction ◽

Coupling Interaction ◽

The Core ◽

Exchange Coupling Interaction

The core-nanoshell composite materials doped with Nd were prepared by a solid-state reaction method. The core is magnetic fly-ash hollow cenosphere, and the shell is the nanosized ferrite doped with Nd. The thermal decomposition process of the sample was investigated by TG- DTA. The morphology and composition of the composite materials were investigated by the X-ray diffraction analysis ( XRD ), scanning electron microscope ( SEM ) and energy disperse spectroscopy ( EDS ). The results of vibrating sample magnetometer ( VSM ) analysis indicated that the exchange-coupling interaction happens between ferrite of magnetic fly-ash hollow cenosphere and nanosized ferrite coating. The exchange-coupling interaction enhances magnetic loss of composite materials. The results show that doped with Nd can enhance the coercivity too, so the magnetic properties could be promoted further. The magnetic properties of the core-nanoshell composite material are better than that of single-phase.

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Physical Mechanisms of Exchange Coupling Effects in Nanoparticulate Diluted Magnetic Oxides Obtained by Laser Pyrolysis

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.7b01500 ◽

2017 ◽

Vol 121 (16) ◽

pp. 9063-9069 ◽

Cited By ~ 2

Author(s):

Victor Eugen Kuncser ◽

Gabriel Alexandru Schinteie ◽

Andrei Cristian Kuncser ◽

Aurel Leca ◽

Monica Scarisoreanu ◽

...

Keyword(s):

Exchange Coupling ◽

Magnetic Oxides ◽

Coupling Effects ◽

Laser Pyrolysis ◽

Physical Mechanisms ◽

Diluted Magnetic Oxides ◽

Diluted Magnetic

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Structural and Dynamic Behavior of Pretwisted Rods and Beams

Applied Mechanics Reviews ◽

10.1115/1.3119490 ◽

1991 ◽

Vol 44 (12) ◽

pp. 483-515 ◽

Cited By ~ 93

Author(s):

Aviv Rosen

Keyword(s):

Composite Materials ◽

Dynamic Analysis ◽

Dynamic Behavior ◽

Static Analysis ◽

High Temperatures ◽

The Other ◽

Present Review ◽

Structural Elements ◽

Coupling Effects ◽

Very High

Because of being important structural elements in many engineering applications on one hand, and presenting inherent complicated coupling effects on the other hand, pretwisted rods have attracted the interest of many researchers. During the years, as a result of engineering breakthroughs, like the introduction of composite materials or operating at very high temperatures, the problems associated with pretwisted rods became more complicated. The present review will present the research during the last fifty years. It will be divided into three main subjects: static analysis, dynamic analysis and stability problems. The review will concentrate on the structural and dynamic aspects of pretwisted rods. Derivations of models and solution techniques will be addressed.

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Preparation and Microwave Absorption Property of the Core-Nanoshell Composite Materials Doped with Nd

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.335-336.36 ◽

2011 ◽

Vol 335-336 ◽

pp. 36-39

Author(s):

Ru Xin Che ◽

Bing Yu ◽

Li Qiu Wei

Keyword(s):

Composite Materials ◽

Fly Ash ◽

Microwave Absorption ◽

Exchange Coupling ◽

Magnetic Loss ◽

Microwave Absorption Property ◽

Absorption Property ◽

Coupling Interaction ◽

The Core ◽

Exchange Coupling Interaction

The core-nanoshell composite materials doped with Nd were prepared by a solid-state reaction method. The core is magnetic fly-ash hollow cenosphere, and the shell is the nanosized ferrite doped with Nd. The thermal decomposition process of the sample was carried out by the thermogravimetry and differential thermal analysis ( TG-DTA ). The morphology and components of the composite materials were investigated by the X-ray diffraction analysis ( XRD ), scanning electron microscope ( SEM ) and energy disperse spectroscopy ( EDS ). The microwave absorption property was investigated by vector network analyzer ( VNA ). The results indicated that the exchange-coupling interaction happens between ferrite of magnetic fly-ash hollow cenosphere and nanosized ferrite coating. The exchange-coupling interaction enhances magnetic loss of composite materials. So, in the frequency between 1 MHz and 1 GHz, the absorbing effectiveness of the core-nanoshell composite absorbers can achieve –31 dB, it is better than single material and is consistent with requirements of the microwave absorbing material at the low-frequency absorption.

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