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Electrodeposition of a High Magnetostriction CoFe Film

Pillars, Jamin R.; Langlois, Eric L.; Arrington, Christian L.; Monson, Todd M.; Hollowell, Andrew E.; Rodriguez, Mark A.

The development of an electrodeposition process for cobalt/iron (CoFe) alloys with minimal oxygen concentration and controlled stoichiometry is necessary for the advancement of magnetostrictive device functionalities. CoFe alloy films were electrodeposited out of a novel chemistry onto copper test structures enabling magnetic displacement testing for magnetostriction calculations. Using a combination of additives that served as oxygen scavengers, grain refiners, and complexing agents in conjunction with a pulsed plating technique, CoFe films were synthesized at thicknesses as high as 10μm with less than 8 at% oxygen at a stoichiometry of 70-75% Co and 25-30% Fe. X-Ray diffraction (XRD) analysis confirmed that these films had a crystal structure consistent with 70% Co 30% Fe Wairuaite with a slight lattice contraction due to Co doping in the film. A novel characterization technique was used to measure the displacement of the CoFe films electrodeposited, as a function of applied magnetic bias, in order to determine the saturation magnetostriction (λS) of the material. With this chemistry and a tailored pulse plating regime, λS values as high as 172 ± 25ppm have been achieved. This is believed by the authors to be the highest reported value of magnetostriction for an electrodeposited CoFe film.

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TYPE Journal Article YEAR 2015
OSTI

Micro-fabricated ion traps for Quantum Information Processing

Maunz, Peter L.; Hollowell, Andrew E.; Lobser, Daniel L.; Nordquist, Christopher N.; Benito, Francisco M.; Clark, Craig R.; Clark, Susan M.; Colombo, Anthony P.; Fortier, Kevin M.; Haltli, Raymond A.; Heller, Edwin J.; Resnick, Paul J.; Rembetski, John F.; Sterk, Jonathan D.; Stick, Daniel L.; Tabakov, Boyan T.; Tigges, Chris P.; Van Der Wall, Jay W.; Dagel, Amber L.; Blain, Matthew G.; Scrymgeour, David S.

Abstract not provided.

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TYPE Presentation YEAR 2015
OSTI
Results 51–75 of 91
Results 51–75 of 91