Magnetic properties of Ni-Fe nanowire arrays: effect of template material and deposition conditions

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review. B, Condensed Matter and Materials Physics

OSTI ID:960941

Singleton, John ^[1]; Aravamudhan, Shyan ^[2]; Goddard, Paul A ^[3]; Bhansali, Shekhar ^[2]

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1. Los Alamos National Laboratory
2. U OF SOUTH FL
3. U OF OXFORD

The objective of this work is to study the magnetic properties of arrays of Ni-Fe nanowires electrodeposited in different template materials such as porous silicon, polycarbonate and alumina. Magnetic properties were studied as a function of template material, applied magnetic field (parallel and perpendicular) during deposition, wire length, as well as magnetic field orientation during measurement. The results show that application of magnetic field during deposition strongly influences the c-axis preferred orientation growth of Ni-Fe nanowires. The samples with magnetic field perpendicular to template plane during deposition exhibits strong perpendicular anisotropy with greatly enhanced coercivity and squareness ratio, particularly in Ni-Fe nanowires deposited in polycarbonate templates. In case of polycarbonate template, as magnetic field during deposition increases, both coercivity and squareness ratio also increase. The wire length dependence was also measured for polycarbonate templates. As wire length increases, coercivity and squarness ratio decrease, but saturation field increases. Such magnetic behavior (dependence on template material, magnetic field, wire length) can be qualitatively explained by preferential growth phenomena, dipolar interactions among nanowires, and perpendicular shape anisotropy in individual nanowires.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 960941
• Report Number(s): LA-UR-08-06666; LA-UR-08-6666; TRN: US201008%%846
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALUMINIUM OXIDES
ANISOTROPY
BEHAVIOR
DEPOSITION
ELECTRODEPOSITION
FUNCTIONS
GRAIN ORIENTATION
GROWTH
INTERACTIONS
IRON
LENGTH
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MATERIALS
NANOSTRUCTURES
NICKEL
ORIENTATION
POLYCARBONATES
SATURATION
SHAPE
SILICON
USES
WIRES