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Studies of deposition order anomaly of exchange coupling in bilayers and trilayers of NiFe and CoO
(American Institute of Physics, 1997-04-15)
The temperature dependence of the exchange field and coercivity and the effect of deposition order have been studied in a series of bilayer (NiFe/CoO and CoO/NiFe) and trilayer (NiFe/CoO/NiFe) films. A profound difference ...
Dynamics of a vortex domain wall in a magnetic nanostrip: application of the collective-coordinate approach
(American Physical Society, 2008-10-01)
The motion of a vortex domain wall in a ferromagnetic strip of submicron width under the influence of an external magnetic field exhibits three distinct dynamical regimes. In a viscous regime at low fields the wall moves ...
Effects of carrier mobility and morphology in organic semiconductor spin valves
(American Institute of Physics, 2009-05-01)
We studied spin transport in four organic semiconductors (OSCs) with different electronic properties. Magnetoresistance (MR) effects were observed up to room temperature in junctions based on an electron-carrying OSC, ...
Longitudinal and perpendicular exchange bias in FeMn/(FeNi/FeMn)n multilayers
(American Institute of Physics, 2003-05-15)
Exchange bias in ferromagnetic (FM)/antiferromagnetic (AF) bilayers is usually investigated in the longitudinal configuration with the exchange coupling established in the film plane. In this work, we report on the ...
Comparison of surface spin wave modes at Fe/MnF2 and Fe/Mn interfaces
(American Institute of Physics, 2000-11-01)
We have studied the thermal demagnetization in semi-infinite ferromagnets in Fe/MnF2 and Fe/Mn bilayers using Mössbauer spectroscopy. We find that the hyperfine field at the Fe/MnF2 interface follows a quasilinear temperature ...
Doubly exchange-biased NiCoO/NiFe/Cu/NiFe/NiCoO spin valves
(American Institute of Physics, 1999-04-15)
A new type of doubly exchange-biased Ni50Co50O/NiFe/Cu/NiFe/Ni30Co70O spin-valve structure, with two ferromagnetic layers exchange biased in opposite directions by two different antiferromagnetic layers is demonstrated. ...
Dependence of exchange coupling on antiferromagnetic layer thickness in NiFe/CoO bilayers
(American Institute of Physics, 1998-06-01)
A systematic study of the dependence of exchange coupling in NiFe/CoO bilayers on CoO layer thickness tAF from 5 to 500 Å has been made. For large CoO thicknesses (tAF>100 Å), the exchange field varies as 1/tAF, whereas ...
Long-range exchange coupling between a ferromagnet and an antiferromagnet across a nonmagnetic spacer layer
(American Institute of Physics, 1997-04-15)
The antiferromagnet/ferromagnet exchange coupling giving rise to a shifted hysteresis loop has usually been considered an interfacial effect. We show evidence that this exchange coupling between an antiferromagnet (CoO) ...
Magnetic core loss of ultrahigh strength FeCo alloys
(American Institute of Physics, 2003-05-15)
Hiperco® 50 alloy heat treated between 450 and 650°C exhibits superior mechanical properties. We report the measurements of the ac core loss at various frequencies up to 4500 Hz of the Hiperco® 50 alloy samples annealed ...
Exchange coupling between Cr and ferromagnetic thin films
(American Institute of Physics, 2003-05-15)
Exchange bias has been observed in Ni81Fe19/Cr bilayers. The exchange bias field for Cr thickness tCr larger than 62 Å increases with tCr and levels off at tCr=150 Å, whereas coercivity increases without saturation. The ...