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16 Apr 2001

Volume 78, Issue 16, pp. 2267-2404

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Angular momentum and energy transferred through ferromagnetic resonance

Albrecht Jander, John Moreland, and Pavel Kabos

Appl. Phys. Lett. 78, 2348 (2001); http://dx.doi.org/10.1063/1.1361095 (3 pages) | Cited 4 times

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We show that ferromagnetic resonance (FMR) selectively transfers angular momentum and energy from a microwave field to the lattice as measurable torque and heat. The expected torque and absorbed power are derived classically in terms of Landau–Lifshitz dynamics, including demagnetizing field effects. The torque is also described as a photon absorption process, in which the absorbed photons carry both energy and angular momentum. FMR data are shown for a thin NiFe film deposited on a micromechanical cantilever detector that measures both torque and heat under nearly identical conditions. © 2001 American Institute of Physics.
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76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Bb Fe and its alloys

Suppression of superconductivity by crystallographic defects in epitaxial Sr2RuO4 films

Mark A. Zurbuchen, Yunfa Jia, Stacy Knapp, Altaf H. Carim, Darrell G. Schlom, Ling-Nian Zou, and Ying Liu

Appl. Phys. Lett. 78, 2351 (2001); http://dx.doi.org/10.1063/1.1364659 (3 pages) | Cited 10 times

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Epitaxial Sr2RuO4 thin films grown by pulsed-laser deposition from high-purity (99.98%) Sr2RuO4 targets on (001) LaAlO3 were found to be not superconducting down to 0.4 K. Structural disorder is believed to be responsible. A correlation was observed between higher resistivity ratios in electrical transport measurements and narrower x-ray diffraction rocking curve widths of the Sr2RuO4 films. High-resolution transmission electron microscopy revealed that the dominant structural defects, i.e., the defects leading to the observed variation in rocking curve widths in the films, are {011} planar defects, with a spacing comparable to the in-plane superconducting coherence length of Sr2RuO4. These results imply that minimizing structural disorder is the key remaining challenge to achieving superconducting Sr2RuO4 films. © 2001 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
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