High Exchange Bias in Fe3−δO4@CoO Core Shell Nanoparticles Synthesized by a One-Pot Seed-Mediated Growth Method

2013 ◽  
Vol 117 (21) ◽  
pp. 11436-11443 ◽  
Author(s):  
Walid Baaziz ◽  
Benoît P. Pichon ◽  
Christophe Lefevre ◽  
Corinne Ulhaq-Bouillet ◽  
Jean-Marc Greneche ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
Growth Method ◽  
Seed Mediated ◽  
Core Shell Nanoparticles

scholarly journals Exchange-bias and magnetic anisotropy fields in core–shell ferrite nanoparticles

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
F. G. Silva ◽  
J. Depeyrot ◽  
Yu. L. Raikher ◽  
V. I. Stepanov ◽  
I. S. Poperechny ◽  
...  
Keyword(s):  
Spin Glass ◽  
Magnetic Moment ◽  
Exchange Bias ◽  
Uniaxial Anisotropy ◽  
Thermal Fluctuations ◽  
High Amplitude ◽  
Spin Coupling ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

AbstractExchange bias properties of MnFe$$_2$$ 2 O$$_4$$ 4 @$$\gamma$$ γ –Fe$$_2$$ 2 O$$_3$$ 3 core–shell nanoparticles are investigated. The measured field and temperature dependencies of the magnetization point out a well-ordered ferrimagnetic core surrounded by a layer with spin glass-like arrangement. Quasi-static SQUID magnetization measurements are presented along with high-amplitude pulse ones and are cross-analyzed by comparison against ferromagnetic resonance experiments at 9 GHz. These measurements allow one to discern three types of magnetic anisotropies affecting the dynamics of the magnetic moment of the well-ordered ferrimagnetic NP’s core viz. the easy-axis (uniaxial) anisotropy, the unidirectional exchange-bias anisotropy and the rotatable anisotropy. The uniaxial anisotropy originates from the structural core–shell interface. The unidirectional exchange-bias anisotropy is associated with the spin-coupling at the ferrimagnetic/spin glass-like interface; it is observable only at low temperatures after a field-cooling process. The rotatable anisotropy is caused by partially-pinned spins at the core/shell interface; it manifests itself as an intrinsic field always parallel to the external applied magnetic field. The whole set of experimental results is interpreted in the framework of superparamagnetic theory, i.e., essentially taking into account the effect of thermal fluctuations on the magnetic moment of the particle core. In particular, it is found that the rotatable anisotropy of our system is of a uniaxial type.

scholarly journals Exchange Bias Phenomenology and Models of Core/Shell Nanoparticles

ChemInform ◽  
2007 ◽  
Vol 38 (8) ◽  
Author(s):  
Oscar Iglesias ◽  
Amilcar Labarta ◽  
Xavier Batlle
Keyword(s):  
Exchange Bias ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Facile one-pot photosynthesis of stable Ag@graphene oxide nanocolloid core@shell nanoparticles with sustainable localized surface plasmon resonance properties

2017 ◽  
Vol 5 (38) ◽  
pp. 10016-10022 ◽  
Author(s):  
Young-Kwan Kim ◽  
Seongchan Kim ◽  
Sung-Pyo Cho ◽  
Hongje Jang ◽  
Hyun Huh ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Photochemical Reaction ◽  
Localized Surface Plasmon Resonance ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
Resonance Properties ◽  
Core Shell Nanoparticles

Stable Ag@graphene oxide nanocolloid (GON) core–shell nanoparticles were synthesized by photochemical reaction.

Synthesis and Properties of InP/ZnS core/shell Nanoparticles with One-pot process

2017 ◽  
Vol 24 (1) ◽  
pp. 11-16
Author(s):  
So Yeong Joo ◽  
Myung Hwan Hong ◽  
Leeseung Kang ◽  
Tae Hyung Kim ◽  
Chan Gi Lee
Keyword(s):  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
Core Shell Nanoparticles

One-pot synthesis of ultrasmall β-NaGdF4 nanoparticles with enhanced upconversion luminescence

2019 ◽  
Vol 7 (29) ◽  
pp. 8898-8904 ◽  
Author(s):  
Chunyan Cheng ◽  
Yueshan Xu ◽  
Songtao Liu ◽  
Yuanyuan Liu ◽  
Xian Wang ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Upconversion Luminescence ◽  
Core Shell ◽  
High Quantum Yield ◽  
High Quality ◽  
Shell Nanoparticles ◽  
One Pot ◽  
High Quantum ◽  
One Pot Synthesis ◽  
Core Shell Nanoparticles

High quality β-NaGdYF4:Yb/Er and high quantum yield β-NaGdF4:Yb/Er@β-NaYF4 core shell nanoparticles were synthesized.

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