Abstract
FeMn nanowires have been synthesized by employing DC electro-deposition technique provided with constant stirring during the growth. The use of anodic aluminum oxide (AAO) templates made it possible to get well aligned nanowires with average diameter around 100 nm. Magnetic field annealing with field strength of 1 T applied at angle 0° and 90° to nanowires axis at different annealing temperatures has been employed to study the variation in structural and magnetic properties of nanowires. XRD analysis shows poor crystallinity of as-synthesized arrays but cubic structure with (110) preferred orientation has been resulted after the annealing process. Furthermore, vibrating sample magnetometer (VSM) has been employed to study the saturation magnetization (Ms), squareness ratio (SQ=Mr/Ms) and coercivity (Hc) of the as-synthesized and annealed samples. The as deposited and annealed NWs arrays show the coherent rotation for magnetization reversal process.
Highlights
The super elasticity and shape memory effect in FeMn and FeMnSi alloys attracted considerable interest for their possible implementation as shape memory alloys in actuators, sensors and in several other potential applications.1–3 Nano-structured antiferromagnetic materials have promising applications in spin valves and the magnetic random access memory (MRAM).4–8 The spin valve multilayer structures are thought to be potential devices in magnetoresistance read heads in magnetic recording industry
For the first time we report FeMn alloy nanowires fabricated by low cost dc electro-deposition method using the nano-channels of porous anodic alumina oxide (AAO) templates with thickness approximately 60 μm
The extra peak of Cu appeared due to the use of copper tape during the analysis and the Al peak owing to the reason that anodic aluminum oxide (AAO) template has been used in the synthesis process and for this analysis the template has not been removed completely
Summary
The super elasticity and shape memory effect in FeMn and FeMnSi alloys attracted considerable interest for their possible implementation as shape memory alloys in actuators, sensors and in several other potential applications. Nano-structured antiferromagnetic materials have promising applications in spin valves and the magnetic random access memory (MRAM). The spin valve multilayer structures are thought to be potential devices in magnetoresistance read heads in magnetic recording industry. Nano-structured antiferromagnetic materials have promising applications in spin valves and the magnetic random access memory (MRAM).. The spin valve multilayer structures are thought to be potential devices in magnetoresistance read heads in magnetic recording industry. Face centered cubic substrate is favorable for the formation of antiferromagnetic γ-fcc phase of FeMn which is necessary for exchange bias in spin valve structures.. Nanowires of anti-ferromagnetic material along with same kind of structure of ferromagnetic material are important in new type of hard magnetic materials. FeMn alloy is important because of having no requirement of long and high heat treatments to get transformed in the necessary antiferromagnetic crystallographic structure.. Most of the research on antiferromagnetic materials deals with thin film structures and nano-particles but there are very less number of reports on anti-ferromagnetic nanowires
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