216 research outputs found
Magnetic structure of domain walls confined in a nano-oxide layer
In the recent years, a spin-valve was developed with a current-confined-path
structure consisting of a non-oxide-layer (NOL). We analyze magnetic structures
of the current-confinedpath in the nano-oxide layer sandwiched between
ferromagnetic electrodes and clarify the dependency of the magnetic structure
on the shape and size of the current-confined-path. Our results of stiffness
energy density and thermal stability shows that we should fabricate a CPP
spin-valve with narrow current-confinedpaths with large aspect ratio and strong
constriction in order to enhance the MR ratio.Comment: 3 pages, 3 figures, proceedings paper of Intermag 200
Effective Resistance Mismatch and Magnetoresistance of a CPP-GMR system with Current-Confined-Paths
We theoretically study the magnetoresistance of a CPP-GMR system with current
confined paths (CCP) in the framework of Valet-Fert theory. The continuity
equations for charge and spin currents are numerically solved with the
three-dimensional CCP geometry by use of finite element method. It is confirmed
that the MR ratio is enhanced by the CCP structure, which is consistent with
the experimental results. Moreover, we find that there exists a certain contact
width which maximize the MR ratio. We show that the contact width which
maximize the MR ratio is well described by the effective resistance matching.Comment: 4 pages, 4 figure
Simulation of current-induced microwave oscillation in geometrically confined domain wall
We studied magnetization dynamics of a geometrically confined domain wall
under dc current by solving simultaneously the Landau-Lifshitz-Gilbert equation
and diffusion equation for spin accumulation. We showed that the oscillation
motion of the domain wall is driven by the spin-transfer torque and the dc
current is converted to the ac voltage signal. The results means that the
geometrically confined domain wall is applicable as a source of microwave
oscillator.Comment: 3 pages, 3 figure
Current-perpendicular-to-plane magnetoresistance of a domain wall confined in a nano-oxide-layer
We theoretically study the current-perpendicular-to-plane magnetoresistance
of a domain wall confined in a current-confined-path (CCP) structure made of a
nano-oxide-layer (NOL). In order to calculate the MR ratio of the system, the
continuity equations for charge and spin currents are numerically solved with
the three-dimensional CCP geometry by use of finite element method. It is
confirmed that the MR ratio is enhanced by the CCP structure, which is
consistent with the experimental results.Comment: 9 pages, 3 figures, 3 author
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