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3 Dec 2001

Volume 79, Issue 23, pp. 3749-3889

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Beam model for calculating magnetostriction strains in thin films and multilayers

Robert C. Wetherhold and Harsh Deep Chopra

Appl. Phys. Lett. 79, 3818 (2001); http://dx.doi.org/10.1063/1.1421224 (3 pages) | Cited 12 times

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A standard technique to measure the magnetostriction strain in thin films involves measurement of the end deflection or slope of cantilever beams using optical deflectometry or capacitive methods. This article presents a general beam model for inferring magnetostriction strain from the end deflection or slope data. This model greatly extends the range of applicability over existing shell models, allowing for inference of magnetostriction strains for practical film/substrate thickness ratios that are important in microelectromechanical systems (MEMS) and bio-microelectromechanical systems (bio-MEMS). If the properties of individual layers are known, the beam theory can be used to design multilayer MEMS or bio-MEMs beams over a full range of thickness ratios. © 2001 American Institute of Physics.
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75.80.+q Magnetomechanical effects, magnetostriction
07.10.Cm Micromechanical devices and systems
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Temperature dependent switching properties of patterned 200 nm Ni81Fe19 elements

Jian Li, Jing Shi, and Saied Tehrani

Appl. Phys. Lett. 79, 3821 (2001); http://dx.doi.org/10.1063/1.1424470 (3 pages) | Cited 18 times

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Quasistatic magnetization switching of patterned 200 nm wide Ni81Fe19 elements has been systematically studied over a wide range of temperatures. In large aspect-ratio elements, the switching field between two bistable magnetization states decreases linearly as the temperature increases, in good agreement with thermally activated nucleation theory. In small aspect-ratio elements, however, switching occurs through a third stable state: the magnetization vortex state. Although the switching mechanism is drastically different in these small aspect-ratio structures, the switching fields also are linearly dependent on temperature. © 2001 American Institute of Physics.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.-i Magnetic properties of thin films, surfaces, and interfaces
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