Shape anisotropy and hybridization enhanced magnetization in nanowires of Fe/MgO/Fe encapsulated in carbon nanotubes

Aryee, Dennis; Seifu, Dereje

doi:10.1016/j.jmmm.2017.01.014

Cited by 5 publications

(11 citation statements)

References 21 publications

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“…The open-ended CNT tips were filled with Fe/ MgO/Fe using DC magnetron for the Fe and RF sputtering method for the insulator (MgO) at a substrate temperature of 100°C. This substrate temperature, 100°C, yielded in planar samples the highest value of coercive field compared to several other synthesis substrate temperatures [12].…”

Section: Methodsmentioning

confidence: 72%

“…In a previous work, it was shown that magnetic force microscopy (MFM) of nanowires of Fe/MgO/Fe revealed the presence of stripe domains [12]; stripe domain was totally absent in films, and it was slightly present in nanocolumns. This shows that the moments are completely aligned in plane in case of thin films.…”

Section: Results From Magnetic Measurementsmentioning

confidence: 98%

“…X-ray magnetic circular dichroism (XMCD) measurements of nanowires of Fe/MgO/Fe were carried out at beamline 4UB at NSLS in BNL [12]. Background-corrected XMCD signal shows that the nanowires' XMCD signal at the Fe L 3 and L 2 edges is larger [12].…”

Section: Results From Magnetic Measurementsmentioning

confidence: 99%

“…The deposition rate for Fe was 0.17 nm/s as calibrated by the deposition time versus thickness measurements for Fe films several hundred nm thick. In my previous research on thin films of Fe/MgO/Fe, several planar samples were synthesized at several substrate temperatures [12]. The film synthesized at 100°C has the highest saturation magnetization.…”

Section: Methodsmentioning

confidence: 99%

“…Surface morphologies of nanowires of Fe/MgO/Fe grown in the interior cylindrical space of CNTs were characterized by SEM/STEM in a previous study [12]. The SEM/STEM scan depicts a uniform composition.…”

Section: Structural Characterizationmentioning

confidence: 99%

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Nanowires of Fe/MgO/Fe Encapsulated in Carbon Nanotubes

Seifu¹

2019

Nanowires - Synthesis, Properties and Applications

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Nanowires of tunneling magnetoresistance (TMR) were synthesized using magnetron DC/RF sputtering by filling Fe/MgO/Fe inside vertically grown and substrate-supported carbon nanotubes. Nanocolumns of Fe/MgO/Fe TMR were synthesized using glancing angle deposition. The magnetic properties of nanowires, nanocolumns and planar nanometric thin films of Fe/MgO/Fe showed similarities including twofold magnetic symmetry. Nanowires of Fe/MgO/Fe showed improved magnetic properties, in particular its coercive field, which is 754% higher than planar thin films of Fe/MgO/Fe. A macroscopic phenomenon that can be explained only by quantum mechanics is TMR, where electrical current can flow across a nanometric thin insulator layer between two electrodes when an external magnetic field is applied parallel to the trilayer system. Coherence in the TMR effect is paramount to make spintronic devices. Nanowires possess shape anisotropy, which can play an important role in coherence.

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Section: Methodsmentioning

confidence: 72%

Section: Results From Magnetic Measurementsmentioning

confidence: 98%