Temperature dependence of exchange bias and training effect in Co/CoO film with induced uniaxial anisotropy

2015 ◽  
Vol 48 (27) ◽  
pp. 275002 ◽  
Author(s):  
R Wu ◽  
J B Fu ◽  
D Zhou ◽  
S L Ding ◽  
J Z Wei ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Exchange Bias ◽  
Uniaxial Anisotropy ◽  
Training Effect ◽  
And Training

scholarly journals Giant Vertical Magnetization Shift Caused by Field-Induced Ferromagnetic Spin Reconfiguration in Ni50Mn36Ga14 Alloy

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4701
Author(s):  
Fanghua Tian ◽  
Yin Zhang ◽  
Chao Zhou ◽  
Qizhong Zhao ◽  
Zhonghai Yu ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Field Dependence ◽  
Exchange Bias ◽  
Training Effect ◽  
Bias Effect ◽  
Exchange Bias Effect ◽  
Recording Technology ◽  
Practical Applications ◽  
Ultrahigh Density ◽  
And Training

Vertical magnetization shift (VMS) is a special type of exchange bias effect that may lead to a revolution in future ultrahigh-density magnetic recording technology. However, there are very few reports focusing on the performance of VMS due to the unclear mechanism. In this paper, a giant vertical magnetization shift (ME) of 6.34 emu/g is reported in the Ni50Mn36Ga14 alloy. The VMS can be attributed to small ferromagnetic ordered regions formed by spin reconfiguration after field cooling, which are embedded in an antiferromagnetic matrix. The strong cooling-field dependence, temperature dependence, and training effect all corroborate the presence of spin reconfiguration and its role in the VMS. This work can enrich VMS research and increase its potential in practical applications as well.

Giant exchange bias behavior and training effect in spin-glass-like NiCr2O4/NiO ceramics

2015 ◽  
Vol 50 (17) ◽  
pp. 5904-5911 ◽  
Author(s):  
L. G. Wang ◽  
C. M. Zhu ◽  
D. L. G. C. Bao ◽  
Z. M. Tian ◽  
S. L. Yuan
Keyword(s):  
Spin Glass ◽  
Exchange Bias ◽  
Training Effect ◽  
And Training

Exchange Bias and Training Effect in Polycrystalline Antiferromagnetic/Ferromagnetic Bilayers

2002 ◽  
Vol 746 ◽  
Author(s):  
Markus Kirschner ◽  
Dieter Suess ◽  
Thomas Schrefl ◽  
Josef Fidler
Keyword(s):  
Layer Thickness ◽  
Exchange Bias ◽  
Ferromagnetic Layer ◽  
Bias Field ◽  
Training Effect ◽  
Hysteresis Cycle ◽  
Weak Exchange ◽  
Antiferromagnetic Layer ◽  
20 Nm ◽  
And Training

ABSTRACTExchange bias and training effect are simulated for IrMn/NiFe bilayers. As a function of the thickness of the antiferromagnet the bias field shows a maximum for a thickness of 22 nm. For decreasing antiferromagnetic thickness the domain wall energy approaches zero. For large thicknesses the high anisotropy energy hinders switching of the antiferromagnetic grains resulting in weak bias. Starting from the field cooled state as initial configuration a bias field of about 8 mT is obtained assuming a antiferromagnetic layer thickness of 20 nm, a ferromagnetic layer thickness of 10 nm, and a grain size of 10 nm. The next hysteresis cycle shows a reduction of the bias field by about 65%. Exchange bias and training effect in fully compensated antiferromagnet/ferromagnet bilayers are explained with a simple micromagnetic model. The model assumes no defects except for grain boundaries, and coupling is due to spin flop at a perfect interface. The simulations show that a weak exchange interaction between randomly oriented antiferromagnetic grains and spin flop coupling at a perfectly compensated interface are sufficient to support exchange bias.

Enhancement of exchange bias and training effect in ion-beam sputtered Fe46Mn54/Ni81Fe19 bilayers

2014 ◽  
Vol 115 (4) ◽  
pp. 043910 ◽  
Author(s):  
Himanshu Fulara ◽  
Sujeet Chaudhary ◽  
Subhash C. Kashyap ◽  
Simon Granville
Keyword(s):  
Exchange Bias ◽  
Ion Beam ◽  
Training Effect ◽  
And Training

Exchange bias and training effect in NiCr2O4/Cr2O3 composite

2015 ◽  
Vol 30 (21) ◽  
pp. 3252-3258
Author(s):  
Wang Liguang ◽  
Zhu Changming ◽  
Tian Zhaoming ◽  
Yuan Songliu
Keyword(s):  
Exchange Bias ◽  
Training Effect ◽  
Image Position ◽  
And Training

Abstract

Study of exchange bias and training effect in NiCr 2 O 4

2015 ◽  
Vol 385 ◽  
pp. 93-98 ◽  
Author(s):  
Junmoni Barman ◽  
Tribedi Bora ◽  
S. Ravi
Keyword(s):  
Exchange Bias ◽  
Training Effect ◽  
And Training

Exchange bias and training effect in Ni/Ag-doped NiO bilayers

2010 ◽  
Vol 322 (5) ◽  
pp. 542-547 ◽  
Author(s):  
P.Y. Yang ◽  
F. Zeng ◽  
F. Pan
Keyword(s):  
Exchange Bias ◽  
Training Effect ◽  
And Training

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.

Temperature dependence of the training effect in aCo∕CoOexchange-bias layer

2005 ◽  
Vol 72 (5) ◽  
Author(s):  
Christian Binek ◽  
Xi He ◽  
Srinivas Polisetty
Keyword(s):  
Temperature Dependence ◽  
Training Effect
Sign in / Sign up

Export Citation Format

Share Document