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24 Jul 2000

Volume 77, Issue 4, pp. 463-603

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Transfer function and noise properties of YBa2Cu3O7−δ direct-current superconducting-quantum-interference-device magnetometers with resistively shunted inductances

F. Kahlmann, W. E. Booij, M. G. Blamire, P. F. McBrien, E. J. Tarte, N. H. Peng, C. Jeynes, E. J. Romans, and C. M. Pegrum

Appl. Phys. Lett. 77, 567 (2000); http://dx.doi.org/10.1063/1.127046 (3 pages) | Cited 6 times

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We have investigated resistively shunted direct-coupled high-Tc dc superconducting quantum interference device (SQUID) magnetometers with four different inductances (50, 100, 150, and 200 pH). The SQUIDs were based on 200 nm thick YBa2Cu3O7−δ films deposited on bicrystal substrates with a 24° misorientation angle, and the shunt resistors were fabricated by masked ion damage. At T = 77 K, good quantitative agreement was observed between the measured maximum voltage modulation depth ΔV and calculated values based on the theoretical predictions by Enpuku et al., whereas the white magnetic flux noise math at 10 kHz of all four devices was found to be a factor of 2.3 higher than predicted. The lowest white magnetic field noise of 153 fT/math was obtained for the magnetometer with a SQUID inductance of 100 pH with an outer dimension of the pickup loop of just 2 mm. © 2000 American Institute of Physics.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures
07.50.Hp Electrical noise and shielding equipment
07.55.Ge Magnetometers for magnetic field measurements
07.55.Jg Magnetometers for susceptibility, magnetic moment, and magnetization measurements

Surface electronic phase transition in colossal magnetoresistive manganese perovskites: La0.65Sr0.35MnO3

Hani Dulli, E. W. Plummer, P. A. Dowben, Jaewu Choi, and S.-H. Liou

Appl. Phys. Lett. 77, 570 (2000); http://dx.doi.org/10.1063/1.127047 (3 pages) | Cited 28 times

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We have observed a distinct surface phase transition for an important class of giant magnetoresistance materials [La1−xSrxMnO3(x = 0.35)]. The surface phase transition occurs at 240 K compared to 370 K for the bulk and is fundamentally different. In the bulk, a ferromagnetic metal to paramagnetic bad-metal transition occurs, while the lower-temperature surface transition is from an insulator to a semimetal. The surface of this manganese perovskite is electronically and compositionally quite different from the bulk with important implications for the behavior of artificially grown layered transition-metal oxides and for the use of surface sensitive techniques to probe the bulk. © 2000 American Institute of Physics.
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71.30.+h Metal-insulator transitions and other electronic transitions
75.47.Gk Colossal magnetoresistance
72.15.Gd Galvanomagnetic and other magnetotransport effects
72.60.+g Mixed conductivity and conductivity transitions
73.25.+i Surface conductivity and carrier phenomena
73.20.At Surface states, band structure, electron density of states

Engineering coercivity in epitaxially grown (110) films of DyFe2–YFe2 superlattices

M. Sawicki, G. J. Bowden, P. A. J. de Groot, B. D. Rainford, J. M. L. Beaujour, R. C. C. Ward, and M. R. Wells

Appl. Phys. Lett. 77, 573 (2000); http://dx.doi.org/10.1063/1.127048 (3 pages) | Cited 11 times

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Molecular beam epitaxial methods have been used to grow single crystal Laves phase DyFe2–YFe2 superlattice samples with a (110) growth direction. It is shown that it is possible, in principle, to engineer a desired coercivity between the limits KDyFe2 ⩽ K ⩽ ∞. This can be achieved by adjusting the relative thickness of the individual DyFe2 and YFe2 layers, in multilayer films This novel feature is illustrated, using the superlattice films [x Å DyFe2/(100-x) Å YFe2]×40, with x = 80, 60, 50, and 45. It is found that the measured coercivity is in semiquantitative agreement with a simple theoretical expression, for the nucleation fields in both bilayer and multilayer compounds. However, in practice, exchange spring penetration into the DyFe2 layers can set a limit to the maximum coercivity that can be achieved. © 2000 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
75.30.Et Exchange and superexchange interactions
68.65.-k Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties
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