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Size and temperature dependence of the magnetic properties of electrodeposited FeCoNiB nanowires

Vieyra, Malini, Meydan, Turgut ORCID: and Ovari, Tibor-Adrian 2013. Size and temperature dependence of the magnetic properties of electrodeposited FeCoNiB nanowires. Sensor Letters 11 (1) , pp. 205-208. 10.1166/sl.2013.2812

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Electrodeposited FeCoNiB nanowires with 10% boron in the electrolyte have been investigated. The focus is on studying the effect of their size on the magnetic characteristics. Both the coercivity and the squareness decreased with the increase in the nanowire diameter. The coercivity for out-of-plane (OOP) measurements varied from 41 to 277 Oe for nanowire arrays of different diameters. For nanowires of 20 and 200 nm in diameter the easy axis is in the OOP direction whereas it is in the in-plane (IP) direction for nanowires of 100 nm in diameter. For most of the samples, the OOP coercivity was higher than the IP coercivity, suggesting lower magnetostatic interactions amongst the nanowires. The OOP axis switched from easy to hard when the nanowire length increased beyond a critical value. EDX investigations showed that the atomic concentration of Fe and Co for the templates with pore diameters of 20 and 100 nm did not vary as much as the change observed for the template with a 200 nm pore diameter. The thermal stability of the FeCoNiB nanowires deposited at 9 mA pulsed current was studied over the temperature range 10–300 K. The OOP coercivity increases from 45 Oe at 300 K to 76 Oe at 10 K. Similarly, the squareness increased from 0.01 at 300 K to 0.023 at 10 K. The obtained results are important for the fabrication of nanowire arrays to be used in integrated microsystems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Uncontrolled Keywords: Electrodeposition; magnetic properties; nanowires; size effect; temperature effect
Additional Information: A Special Issue on Magnetic Sensors.
Publisher: American Scientific Publishers
ISSN: 1546-198X
Last Modified: 27 Oct 2022 08:13

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