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11 Jan 1999

Volume 74, Issue 2, pp. 161-325

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Tunneling magnetoresistance at up to 270 K in La0.8Sr0.2MnO3/SrTiO3/La0.8Sr0.2MnO3 junctions with 1.6-nm-thick barriers

Takeshi Obata, Takashi Manako, Yuichi Shimakawa, and Yoshimi Kubo

Appl. Phys. Lett. 74, 290 (1999); http://dx.doi.org/10.1063/1.123002 (3 pages) | Cited 68 times

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Magnetic tunneling junctions are fabricated from epitaxially grown La0.8Sr0.2MnO3/SrTiO3/La0.8Sr0.2MnO3 trilayers. A large tunneling magnetoresistance of 150% is observed for a junction with a thin barrier layer (1.6 nm) under a low switching field (<10 Oe) at 5 K. A small tunneling magnetoresistance is observed even at 270 K, which is close to the ferromagnetic Curie temperature (290 K) of the La0.8Sr0.2MnO3 film. The large magnetoresistance and high operating temperature are attributed to the sufficiently thin and uniform barrier layer of SrTiO3. © 1999 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.47.Gk Colossal magnetoresistance
75.47.De Giant magnetoresistance
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.50.Dd Nonmetallic ferromagnetic materials
73.40.Gk Tunneling

Highly sensitive magnetometers based on YBa2Cu3O7 Josephson junction arrays

S. Krey, O. Brügmann, and M. Schilling

Appl. Phys. Lett. 74, 293 (1999); http://dx.doi.org/10.1063/1.123003 (3 pages) | Cited 5 times

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The dependence of the critical current of a Josephson junction on the magnetic flux in the junction area can be used for the sensitive detection of external magnetic fields. In contrast to superconducting quantum interference devices, also the measurement of absolute magnetic fields is possible. To increase the transfer function ∂V/∂B, we use serial arrays of up to 105 Josephson junctions between flux-concentrating areas on 24° SrTiO3 bicrystal substrates. We investigate the scaling properties of the critical current Ic, the normal state resistance Rn and the flux density noise math in dependence on the number of Josephson junctions in the serial array. By the use of a magnetic field modulation scheme, the 1/f noise from critical current fluctuations in the junctions can be suppressed. At 77 K, we achieve a white noise level of math = 1.2 pT/math for a 105-junction array. © 1999 American Institute of Physics.
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07.55.Ge Magnetometers for magnetic field measurements
85.25.Cp Josephson devices
74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
74.25.Sv Critical currents
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