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27 Jul 1998

Volume 73, Issue 4, pp. 423-552

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Spin-dependent tunneling in discontinuous Co–SiO2 magnetic tunnel junctions

Sandra Sankar, A. E. Berkowitz, and David J. Smith

Appl. Phys. Lett. 73, 535 (1998); http://dx.doi.org/10.1063/1.121924 (3 pages) | Cited 20 times

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Discontinuous magnetic tunnel junctions (DMTJs) are an alternate system to the magnetic tunnel junctions (MTJ) currently being considered for magnetoresistance (MR) sensors. The DMTJs are easier to fabricate and more robust than the MTJs. The nominal film structure is SiO2(20 Å)/Co(tCo)/SiO2(30 Å)/Co(tCo)/SiO2(20 Å), in which the thin Co layers are discontinuous, in the form of nanoparticles. Magneto-transport measurements were made perpendicular to the film plane on macroscopic junctions for in-plane applied magnetic fields. The results, for these films with only two magnetic layers, are similar to those of the discontinuous multilayers previously reported. The MR response is relatively sharp and almost linear at low magnetic fields and is reproducible from one junction to another. This MR (defined as ΔV/Vmax) is weakly temperature dependent with a maximum between 4 and 300 K. The MR and the magnetization at low temperature suggest ferromagnetically coupled particles, which switch in lower magnetic fields than noninteracting particles. © 1998 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.45.+j Macroscopic quantum phenomena in magnetic systems
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Cc Other ferromagnetic metals and alloys

Kerr-rotation imaging in scanning near-field optical microscopy using a modified Sagnac interferometer

B. L. Petersen, A. Bauer, G. Meyer, T. Crecelius, and G. Kaindl

Appl. Phys. Lett. 73, 538 (1998); http://dx.doi.org/10.1063/1.121925 (3 pages) | Cited 23 times

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A scanning near-field optical microscope is combined with a modified Sagnac interferometer to generate high-resolution magnetic contrast images of a magneto-optical disk (MOD) in reflection. The interferometer acts as a magnetic sensor to determine the Kerr rotation of reflected circularly polarized light. A separate shear-force sample topography is obtained simultaneously with the optical. This technique allows successful magnetic imaging of samples with complicated surface topographies, as demonstrated with the MOD. For these initial measurements, the resolution with nonmetal-coated fiber tips is 300 nm, and the magnetic phase sensitivity is 1 mrad. © 1998 American Institute of Physics.
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07.79.Fc Near-field scanning optical microscopes
68.35.B- Structure of clean surfaces (and surface reconstruction)
07.60.Ly Interferometers
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