Interplay between exchange bias and uniaxial anisotropy in a ferromagnetic/antiferromagnetic exchange-coupled system

2005 ◽  
Vol 71 (21) ◽  
Author(s):  
S. H. Chung ◽  
A. Hoffmann ◽  
M. Grimsditch
Keyword(s):  
Exchange Bias ◽  
Uniaxial Anisotropy ◽  
Coupled System ◽  
Antiferromagnetic Exchange

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.

Ultrafast Time Resolved Photoinduced Magnetization Rotation in a Ferromagnetic/Antiferromagnetic Exchange Coupled System

1999 ◽  
Vol 82 (18) ◽  
pp. 3705-3708 ◽  
Author(s):  
Ganping Ju ◽  
A. V. Nurmikko ◽  
R. F. C. Farrow ◽  
R. F. Marks ◽  
M. J. Carey ◽  
...  
Keyword(s):  
Coupled System ◽  
Antiferromagnetic Exchange ◽  
Time Resolved ◽  
Magnetization Rotation ◽  
Photoinduced Magnetization

scholarly journals Tuning antiferromagnetic exchange interaction for spontaneous exchange bias in MnNiSnSi system

APL Materials ◽  
2017 ◽  
Vol 5 (12) ◽  
pp. 126105 ◽  
Author(s):  
Liyun Jia ◽  
Jianlei Shen ◽  
Mengmeng Li ◽  
Xi Wang ◽  
Li Ma ◽  
...  
Keyword(s):  
Exchange Interaction ◽  
Exchange Bias ◽  
Antiferromagnetic Exchange ◽  
Antiferromagnetic Exchange Interaction

scholarly journals Voltage control of unidirectional anisotropy in ferromagnet-multiferroic system

2018 ◽  
Vol 4 (11) ◽  
pp. eaat4229 ◽  
Author(s):  
Sasikanth Manipatruni ◽  
Dmitri E. Nikonov ◽  
Chia-Ching Lin ◽  
Bhagwati Prasad ◽  
Yen-Lin Huang ◽  
...  
Keyword(s):  
Electric Field ◽  
Exchange Bias ◽  
Room Temperature ◽  
Uniaxial Anisotropy ◽  
Complementary Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
State Variables ◽  
Ultralow Energy ◽  
Unidirectional Anisotropy ◽  
Beyond Cmos

Demonstration of ultralow energy switching mechanisms is imperative for continued improvements in computing devices. Ferroelectric (FE) and multiferroic (MF) order and their manipulation promise an ideal combination of state variables to reach attojoule range for logic and memory (i.e., ~30× lower switching energy than nanoelectronics). In BiFeO3(BFO), the coupling between the antiferromagnetic (AFM) and FE order is robust at room temperature, scalable in voltage, stabilized by the FE order, and can be integrated into a fabrication process for a beyond-CMOS (complementary metal-oxide semiconductor) era. The presence of the AFM order and a canted magnetic moment in this system causes exchange interaction with a ferromagnet such as Co0.9Fe0.1or La0.7Sr0.3MnO3. Previous research has shown that exchange coupling (uniaxial anisotropy) can be controlled with an electric field. However, voltage modulation of unidirectional anisotropy, which is preferred for logic and memory technologies, has not yet been demonstrated. Here, we present evidence for electric field control of exchange bias of laterally scaled spin valves that is exchange coupled to BFO at room temperature. We show that the exchange bias in this bilayer is robust, electrically controlled, and reversible. We anticipate that magnetoelectricity at these scaled dimensions provides a powerful pathway for computing beyond modern nanoelectronics by enabling a new class of nonvolatile, ultralow energy computing elements.

Increase in ferromagnetic/antiferromagnetic exchange bias due to a reduction of the interfacial exchange interaction

2003 ◽  
Vol 94 (10) ◽  
pp. 6678-6682 ◽  
Author(s):  
F. Ernult ◽  
B. Dieny ◽  
L. Billard ◽  
F. Lançon ◽  
J. R. Regnard
Keyword(s):  
Exchange Interaction ◽  
Exchange Bias ◽  
Antiferromagnetic Exchange

Tailoring the exchange bias via shape anisotropy in ferromagnetic/antiferromagnetic exchange-coupled systems

2003 ◽  
Vol 67 (22) ◽  
Author(s):  
A. Hoffmann ◽  
M. Grimsditch ◽  
J. E. Pearson ◽  
J. Nogués ◽  
W. A. A. Macedo ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Shape Anisotropy ◽  
Coupled Systems ◽  
Antiferromagnetic Exchange

Antiferromagnetic exchange spring as the reason of exchange bias training effect

2014 ◽  
Vol 105 (3) ◽  
pp. 032407 ◽  
Author(s):  
A. N. Dobrynin ◽  
F. Maccherozzi ◽  
S. S. Dhesi ◽  
R. Fan ◽  
P. Bencok ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Training Effect ◽  
Antiferromagnetic Exchange ◽  
Exchange Spring
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