scholarly journals Improved exchange bias and blocking temperature of PtCr/PtMn bilayer antiferromagnets

AIP Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 035306 ◽  
Author(s):  
Masamichi Saito ◽  
Fumihito Koike
Keyword(s):  
Exchange Bias ◽  
Blocking Temperature

scholarly journals Magnetic properties of iron cluster/chromium matrix nanocomposites

2015 ◽  
Vol 6 ◽  
pp. 1158-1163 ◽  
Author(s):  
Arne Fischer ◽  
Robert Kruk ◽  
Di Wang ◽  
Horst Hahn
Keyword(s):  
Exchange Bias ◽  
Cluster Size ◽  
Complete Characterization ◽  
Blocking Temperature ◽  
Antiferromagnetic Coupling ◽  
Magnetic Characteristics ◽  
Iron Cluster ◽  
The Matrix ◽  
Cluster Distance ◽  
Matrix Nanocomposites

A custom-designed apparatus was used for the fine-tuned co-deposition of preformed Fe clusters into antiferromagnetic Cr matrices. Three series of samples with precisely defined cluster sizes, with accuracy to a few atoms, and controlled concentrations were fabricated, followed by a complete characterization of structure and magnetic performance. Relevant magnetic characteristics, reflecting the ferromagnetic/antiferromagnetic coupling between Fe clusters and the Cr matrix, i.e., blocking temperature, coercivity field, and exchange bias were measured and their dependence on cluster size and cluster concentration in the matrix was analyzed. It is evident that the blocking temperatures are clearly affected by both the cluster size and their concentration in the Cr matrix. In contrast the coercivity shows hardly any dependence on size or inter-cluster distance. The exchange bias was found to be strongly sensitive to the cluster size but not to the inter-cluster distances. Therefore, it was concluded to be an effect that is purely localized at the interfaces.

Large perpendicular exchange bias and high blocking temperature in Al-doped Cr2O3/Co thin film systems

2017 ◽  
Vol 10 (7) ◽  
pp. 073003 ◽  
Author(s):  
Tomohiro Nozaki ◽  
Yohei Shiokawa ◽  
Yukie Kitaoka ◽  
Yohei Kota ◽  
Hiroshi Imamura ◽  
...  
Keyword(s):  
Thin Film ◽  
Exchange Bias ◽  
Blocking Temperature

Exchange Bias in Co/FeMn and Co/IrMn Structures Induced by Deposition in Presence of Magnetic Field

2012 ◽  
Vol 190 ◽  
pp. 93-96
Author(s):  
I.O. Dzhun ◽  
N.G. Chechenin ◽  
S.A. Dushenko ◽  
E.A. Konstantinova
Keyword(s):  
Magnetic Field ◽  
Angular Dependence ◽  
Exchange Bias ◽  
Low Temperatures ◽  
Resonance Field ◽  
Blocking Temperature ◽  
Bilayer Structure ◽  
Magnetron Deposition ◽  
Unidirectional Anisotropy ◽  
Antiferromagnetic Layer

By measuring the angular dependence of ferromagnetic resonance field at room and low temperatures, it is demonstrated that the magnitude of magnetic field applied during magnetron deposition of Ta/F/AF/Ta structures, where F=Co, NiFe and AF=FeMn and IrMn, influences the uniaxial and unidirectional anisotropy, magnetization and the exchange bias blocking temperature. The deposition field effects on the bilayer structure are compared with the effects on a similar structure, but without antiferromagnetic layer. The exchange bias blocking temperature of investigated structures is found to be significantly lower than the Néel temperature of a bulk antiferromagnet. The origin of the observed effects is shortly discussed.

Effect of shell thickness on the exchange bias blocking temperature and coercivity in Co-CoO core-shell nanoparticles

2017 ◽  
Vol 122 (6) ◽  
pp. 063902 ◽  
Author(s):  
S. Thomas ◽  
K. Reethu ◽  
T. Thanveer ◽  
M. T. Z. Myint ◽  
S. H. Al-Harthi
Keyword(s):  
Exchange Bias ◽  
Shell Thickness ◽  
Blocking Temperature ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Exchange bias of CoO1−δ/(NiFe,Fe) system with blocking temperature beyond Néel temperature of bulk CoO

2015 ◽  
Vol 107 (17) ◽  
pp. 172404 ◽  
Author(s):  
S. L. Ding ◽  
R. Wu ◽  
J. B. Fu ◽  
X. Wen ◽  
H. L. Du ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Blocking Temperature ◽  
Neel Temperature ◽  
Néel Temperature

scholarly journals Dilution-induced enhancement of the blocking temperature in exchange-bias heterosystems

2001 ◽  
Vol 65 (1) ◽  
Author(s):  
Xi Chen ◽  
Ch. Binek ◽  
A. Hochstrat ◽  
W. Kleemann
Keyword(s):  
Exchange Bias ◽  
Blocking Temperature

Robust ferromagnetic insulating and large exchange bias in LaMnO3:CoO composite thin films

2022 ◽  
Author(s):  
Xiaoyu Zhang ◽  
Ya-jun Tao ◽  
Pei-jie Jiao ◽  
Jian Wang ◽  
Ji Zhang ◽  
...  
Keyword(s):  
Thin Films ◽  
Exchange Bias ◽  
Bias Field ◽  
Blocking Temperature ◽  
Composite Thin Films ◽  
Spintronic Devices ◽  
Actual Application ◽  
X Ray Absorption ◽  
Interfacial Charge ◽  
Charge Defect

Abstract Ferromagnetic insulators have received widespread attention for applications in novel low power consumption spintronic devices. Further optimizing the robust ferromagnetic insulating and developing multifunctional ferromagnetic insulator by integrating other magnetic property can not only ease or pave the way for actual application, but also provide an additional freedom degree for device designing. In this work, by introducing antiferromagnetic CoO into ferromagnetic insulator LaMnO3, we have constructed (1-x)LaMnO3:xCoO composite thin films. The films simultaneously show robust ferromagnetic insulator characteristics and large exchange bias. For x = 0.5 sample, the resistivity is 120 Ω·cm at 250 K while the magnetization is 100 emu/cm3 and the exchange bias field is -2200 Oe at 10 K. Especially, the blocking temperature is up to 140 K. Synchrotron radiation x-ray absorption spectroscopy reveals the coexistence of Mn3+, Mn2+, Co2+ and Co3+, arising from interfacial charge transfer and space charge/defect trapping, should be responsible for the enhanced and integrated multifunctional magnetic properties.

High exchange-bias blocking temperature in an ultrathin amorphous antiferromagnet system

2021 ◽  
Vol 104 (10) ◽  
Author(s):  
Jiajun Guo ◽  
Xiaonan Zhao ◽  
Zhijian Lu ◽  
Peng Shi ◽  
Yufeng Tian ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Blocking Temperature
Sign in / Sign up

Export Citation Format

Share Document