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1 Feb 1999

Volume 74, Issue 5, pp. 635-772

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Pseudo-Hall effect in spin-valve multilayers

Guohong Li, Zhengqi Lu, Chunlin Chai, Hongwei Jiang, and Wuyan Lai

Appl. Phys. Lett. 74, 747 (1999); http://dx.doi.org/10.1063/1.123111 (3 pages) | Cited 9 times

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Magnetoresistance and the pseudo-Hall effect in NiFe/Cu/NiFe/FeMn spin-valve multilayers were measured simultaneously in fields rotating in the film plane. Large pseudo-Hall voltages have been observed when the magnetization of the free layer was perpendicular to the sensing current, which was applied along the magnetization of the pinned layer. The pseudo-Hall voltages cannot be explained by treating the anisotropic magnetoresistance of the two permalloy layers independently. Such a cross effect of the free and pinned layers on the anisotropic magnetoresistance is dependent upon the angle between their magnetization. © 1999 American Institute of Physics.
Show PACS
75.47.De Giant magnetoresistance
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.50.Ss Magnetic recording materials
73.61.At Metal and metallic alloys

Microwave characterization of Nd0.67Sr0.33MnO3−x thin films for magnetically tunable filters

J. Wosik, L.-M. Xie, M. Strikovski, J. H. Miller, and P. Przyslupski

Appl. Phys. Lett. 74, 750 (1999); http://dx.doi.org/10.1063/1.123191 (3 pages) | Cited 15 times

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We report on the microwave properties of Nd0.67Sr0.33MnO3−x (NSMO) and NSMO/YBa2Cu3O7−x thin film heterostructures. The quality factor (Q) and center frequency of a 13 GHz shielded dielectric cavity resonator, with the film comprising one surface, were measured as functions of temperature and direct current magnetic field. The Q versus field data was theoretically simulated using the Landau–Lifschitz–Gilbert dynamic permeability equation thus demonstrating that the microwave losses are determined by the ferromagnetic properties of the films. Our results indicate that the field-dependent permeability μ(B) of NSMO films holds the potential to create magnetically tunable microwave devices. © 1999 American Institute of Physics.
Show PACS
84.30.Vn Filters
84.40.Az Waveguides, transmission lines, striplines
84.40.Dc Microwave circuits
75.50.Dd Nonmetallic ferromagnetic materials

Unusual power dependence of two-tone intermodulation in high-Tc superconducting microwave resonators

Balam A. Willemsen, K. E. Kihlstrom, and T. Dahm

Appl. Phys. Lett. 74, 753 (1999); http://dx.doi.org/10.1063/1.123112 (3 pages) | Cited 29 times

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We study the power dependence of two-tone intermodulation arising in high-Tc superconducting microwave resonators as a function of each tone separately. In the regime where the intermodulation power varies as the square of the input power for equally strong tones, we observe unexpected behavior of the power dependence on the individual tones. We show that this behavior can be understood in terms of a nonlinear inductance which varies linearly with the magnitude of the input current. These findings provide a consistent phenomenological picture of the unusual power dependence and should place constraints on a microscopic description of nonlinear behavior in high-Tc films where the intermodulation products vary like the square of the input power. © 1999 American Institute of Physics.
Show PACS
84.40.Az Waveguides, transmission lines, striplines
85.25.-j Superconducting devices
74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
74.25.N- Response to electromagnetic fields
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