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2 Nov 1998

Volume 73, Issue 18, pp. 2543-2690

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Magnetic resonance imaging of hyperpolarized 129Xe produced by spin exchange with diode-laser pumped Cs

D. Levron, D. K. Walter, S. Appelt, R. J. Fitzgerald, D. Kahn, S. E. Korbly, K. L. Sauer, W. Happer, T. L. Earles, L. J. Mawst, D. Botez, M. Harvey, L. DiMarco, J. C. Connolly, H. E. Möller, et al.

Appl. Phys. Lett. 73, 2666 (1998); http://dx.doi.org/10.1063/1.122547 (3 pages) | Cited 6 times

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We report the results of experiments leading to the production of an image of a polarized 129Xe sample prepared by spin exchange with Cs, optically pumped with a spectrally narrowed 894.3 nm diode laser. Representative images of the average electron spin polarization are shown. Appreciable cesium electron polarization values were achieved, and a nuclear polarization of about 2.5% was measured for 129Xe. The absolute nuclear polarization was measured by water-calibrated free induction decay of the nuclear magnetic resonance signal, and the polarized xenon imaged using a 2 T magnetic resonance imaging system. © 1998 American Institute of Physics.
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76.60.-k Nuclear magnetic resonance and relaxation

Wavelength dependence of the magnetic resolution of the magneto-optical near-field scanning tunneling microscope

R. Schad, S. M. Jordan, M. J. P. Stoelinga, M. W. J. Prins, R. H. M. Groeneveld, H. van Kempen, and H. W. van Kesteren

Appl. Phys. Lett. 73, 2669 (1998); http://dx.doi.org/10.1063/1.122548 (3 pages) | Cited 3 times

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A magneto-optical near-field scanning tunneling microscope is used to image the prewritten magnetic domain structure of a Pt/Co multilayer. A semiconducting tip acts as a local photodetector to measure the magnetic circular dichroism signal coming from the magnetic sample. The resolution of the magnetic imaging is given by the photoelectrically active volume of the tip. Reduction of the laser light wavelength resulted in a factor of 4 improvement of the magnetic resolution. Based on a sound and applicable definition we estimate the resolution to be (60±35) nm for a wavelength of 532 nm. © 1998 American Institute of Physics.
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07.79.Cz Scanning tunneling microscopes
78.20.Ls Magneto-optical effects
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Cc Other ferromagnetic metals and alloys
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
68.37.Ps Atomic force microscopy (AFM)
68.37.Rt Magnetic force microscopy (MFM)
68.37.Uv Near-field scanning microscopy and spectroscopy
85.70.Sq Magnetooptical devices
78.66.Bz Metals and metallic alloys
75.60.Ch Domain walls and domain structure
75.70.Kw Domain structure (including magnetic bubbles and vortices)

Correlation between magnetic homogeneity, oxygen content, and electrical and magnetic properties of perovskite manganite thin films

M. Rajeswari, R. Shreekala, A. Goyal, S. E. Lofland, S. M. Bhagat, K. Ghosh, R. P. Sharma, R. L. Greene, R. Ramesh, T. Venkatesan, and T. Boettcher

Appl. Phys. Lett. 73, 2672 (1998); http://dx.doi.org/10.1063/1.122549 (3 pages) | Cited 58 times

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Perovskite manganese oxide materials known for the phenomenon of colossal magnetoresistance often exhibit anomalously large 1/f noise and large, temperature-dependent ferromagnetic resonance (FMR) linewidths. We show that in epitaxial films, these anomalies are very sensitive to oxygen partial pressure during film growth and to postdeposition thermal processing in oxygen, suggesting that oxygen stoichiometry plays a key role. We find that the temperature coefficient of resistance (TCR) at the metal–insulator transition increases and the FMR linewidth decreases as we increase the oxygen partial pressure during growth. Postdeposition heat treatment in oxygen leads to further increase in TCR and decrease in FMR linewidth, accompanied by a dramatic reduction in 1/f noise magnitudes. © 1998 American Institute of Physics.
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75.50.Dd Nonmetallic ferromagnetic materials
75.70.Ak Magnetic properties of monolayers and thin films
72.60.+g Mixed conductivity and conductivity transitions
61.66.Bi Elemental solids
61.66.Dk Alloys
72.15.Gd Galvanomagnetic and other magnetotransport effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
72.70.+m Noise processes and phenomena
68.55.Nq Composition and phase identification
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
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