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16 Aug 1999

Volume 75, Issue 7, pp. 885-1026

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Enhanced magnetoresistance in sintered granular manganite/insulator systems

D. K. Petrov, L. Krusin-Elbaum, J. Z. Sun, C. Feild, and P. R. Duncombe

Appl. Phys. Lett. 75, 995 (1999); http://dx.doi.org/10.1063/1.124577 (3 pages) | Cited 120 times

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We report significant enhancements of magnetoresistance in granular (La0.67Ca0.33MnO3)x/(SrTiO3)1−x. The system exhibits a conduction threshold at x = xc ∼ 60%, around which magnetoresistance versus x has a maximum. The composition xc at which maximum enhancement in magnetoresistance is observed is the same at high (around 5 T) and at low (a few hundred Oersted) fields. The enhancement is consistent with the disorder-driven amplification of spin-dependent transport at the structural boundaries of the mixture. © 1999 American Institute of Physics.
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75.47.Gk Colossal magnetoresistance
75.50.Dd Nonmetallic ferromagnetic materials
72.20.My Galvanomagnetic and other magnetotransport effects

Observation of optical isolation based on nonreciprocal phase shift in a Mach–Zehnder interferometer

J. Fujita, M. Levy, R. U. Ahmad, R. M. Osgood, M. Randles, C. Gutierrez, and R. Villareal

Appl. Phys. Lett. 75, 998 (1999); http://dx.doi.org/10.1063/1.124949 (3 pages) | Cited 12 times

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Measurements up to 45° nonreciprocal phase shift using the transverse magneto-optical effect have been made in a hybrid Mach–Zehnder waveguide/fiber interferometer. BiLu-IG waveguides of various thicknesses and lengths have been used to study the length and thickness dependence of the effect at λ = 1.55 μm. This interferometric scheme is also employed to observe optical isolation; an extinction ratio of 11 dB is obtained for the 45° nonreciprocal phase shift, in agreement with theoretical predictions. © 1999 American Institute of Physics.  
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07.60.Ly Interferometers
85.70.Sq Magnetooptical devices
42.82.Et Waveguides, couplers, and arrays
07.60.Vg Fiber-optic instruments
42.79.-e Optical elements, devices, and systems
85.70.Ge Ferrite and garnet devices
42.81.Pa Sensors, gyros

Ballistic electron magnetic microscopy: Imaging magnetic domains with nanometer resolution

W. H. Rippard and R. A. Buhrman

Appl. Phys. Lett. 75, 1001 (1999); http://dx.doi.org/10.1063/1.124578 (3 pages) | Cited 36 times

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A variation of ballistic electron emission microscopy has been developed to image magnetic structure in thin-film multilayers with nanometer resolution. In studies of nominally uncoupled Co/Cu/Co trilayer films, magnetic domains and domain-wall motion are readily observable with this technique. In the Co/Cu/Co trilayer system magnetic domains are found to occur on an ∼500-nm-length scale and less, while smaller-scale fluctuations in the ballistic electron transport properties of the system are found on an ∼10 nm length scale. © 1999 American Institute of Physics.
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75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
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