Electrodeposition of high magnetostrictive cobalt-iron alloy films for smart tags and sensor applications

Thesis/Dissertation · Tue Dec 01 04:00:00 EST 2015

OSTI ID:1226119

Pillars, Jamin Ryan ^[1]

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1. Univ. of New Mexico, Albuquerque, NM (United States)

Magnetostrictive CoFe films were investigated for use as magnetoelastic tags or sensors. The ability to electrodeposit these films enables batch fabrication processes to pattern a variety of geometries while controlling the film stoichiometry and crystallography. In current research looking at CoFe, improved magnetostriction was achieved using a co-sputtering, annealing, and quenching method1. Other current research has reported electrodeposited CoFe films using a sulfate based chemistry resulting in film compositions that are Fe rich in the range of Co_0.3-0.4Fe_0.7-0.6 and have problems of codeposition of undesirables that can have a negative impact on magnetic properties. The research presented here focused on maximizing magnetostriction at the optimal stoichiometry range of Co_0.7-0.75Fe_0.3-0.25, targeting the (fcc+bcc)/bcc phase boundary, and using a novel chemistry and plating parameters to deposit films without being limited to “line of sight” deposition.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1226119
• Report Number(s): SAND2015--9824T; 608064
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE