scholarly journals Exchange biasing by Ir19Mn81: Dependence on temperature, microstructure and antiferromagnetic layer thickness

2000 ◽  
Vol 88 (2) ◽  
pp. 975-982 ◽  
Author(s):  
J. van Driel ◽  
F. R. de Boer ◽  
K.-M. H. Lenssen ◽  
R. Coehoorn
Keyword(s):  
Layer Thickness ◽  
Exchange Biasing ◽  
Antiferromagnetic Layer

Exchange biasing in MBE grown Fe3O4/CoO bilayers: The antiferromagnetic layer thickness dependence

1996 ◽  
Vol 79 (8) ◽  
pp. 5103 ◽  
Author(s):  
P. J. van der Zaag ◽  
A. R. Ball ◽  
L. F. Feiner ◽  
R. M. Wolf ◽  
P. A. A. van der Heijden
Keyword(s):  
Layer Thickness ◽  
Thickness Dependence ◽  
Exchange Biasing ◽  
Antiferromagnetic Layer

Iron Oxide Shell as the Oxidation-Resistant Layer in SmCo5@Fe2O3 Core–Shell Magnetic Nanoparticles

2007 ◽  
Vol 7 (1) ◽  
pp. 356-361 ◽  
Author(s):  
Xiaowei Teng ◽  
Hong Yang
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Pentacarbonyl ◽  
Trioctylphosphine Oxide ◽  
Oxide Shell ◽  
Ambient Conditions ◽  
Exchange Biasing ◽  
Antiferromagnetic Layer ◽  
Co Nanoparticles ◽  
Resistant Layer

This paper presents a synthesis of magnetic nanoparticles of samarium cobalt alloys and the use of iron oxide as a coating layer to prevent the rapid oxidation of as-made Sm–Co nanoparticles. The colloidal nanoparticles of Sm–Co alloys were made in octyl ether using samarium acetylacetonate and dicobalt octacarbonyl as precursors in a mixture of 1,2-hexadecanediol, oleic acid, and trioctylphosphine oxide (TOPO). Such Sm–Co nanoparticle could be readily oxidized by air and formed a CoO antiferromagnetic layer. Exchange biasing was observed for the surface oxidized nanoparticles. In situ thermal decomposition of iron pentacarbonyl was used to create iron oxide shells on the Sm–Co nanoparticles. The iron oxide shell could prevent Sm–Co nanoparticles from rapid oxidation upon the exposure to air at ambient conditions.

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.

Critical Thickness of Antiferromagnetic Layer in Exchange Biasing Bilayer System

2008 ◽  
Vol 77 (4) ◽  
pp. 044602 ◽  
Author(s):  
Chiharu Mitsumata ◽  
Akimasa Sakuma ◽  
Kazuaki Fukamichi ◽  
Masakiyo Tsunoda ◽  
Migaku Takahashi
Keyword(s):  
Critical Thickness ◽  
Bilayer System ◽  
Exchange Biasing ◽  
Antiferromagnetic Layer

Antiferromagnetic layer thickness dependence of noncollinear uniaxial and unidirectional anisotropies in NiFe/FeMn/CoFe trilayers

2010 ◽  
Vol 81 (22) ◽  
Author(s):  
Hyeok-Cheol Choi ◽  
Chun-Yeol You ◽  
Ki-Yeon Kim ◽  
Jeong-Soo Lee ◽  
Je-Ho Shim ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Thickness Dependence ◽  
Antiferromagnetic Layer

Critical curves in NiFe/FeMn bilayers with varying antiferromagnetic layer thickness

2021 ◽  
Author(s):  
Daniel J Adams ◽  
Dorin Cimpoesu ◽  
Simeon P Benit ◽  
Danielle Maurin ◽  
Paula Kern ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Critical Curves ◽  
Antiferromagnetic Layer
Sign in / Sign up

Export Citation Format

Share Document