|Title:||Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane|
Vorobjova, A. I.
Shimanovich, D. L.
Sayyed, M. I.
|Keywords:||публикации ученых;porous anodic alumina;template synthesis;nickel;nanowire arrays;anodizing;electrodeposition;magnetic properties;magnetic anisotropy|
|Citation:||Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane / D. Tishkevich [et al.] // Nanomaterials. – 2021. – № 11 (7). – P. 1–17. – DOI : https://doi.org/10.3390/nano11071775.|
|Abstract:||High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2 K. Microscopic and X-ray diffraction results showed that Ni nanowires are homogeneous, with smooth walls and mostly single-crystalline materials with a 220-oriented growth direction. The magnetic properties of the samples (coercivity and squareness) depend more on the length of the nanowires and the packing factor (the volume fraction of the nanowires in the membrane). It is shown that the dipolar interaction changes the demagnetizing ﬁeld during a reversal magnetization of the Ni nanowires, and the general effective ﬁeld of magnetostatic uniaxial shape anisotropy. The effect of magnetostatic interaction between ultra-long nanowires (with an aspect ratio of >500) in samples with a packing factor of ≥37% leads to a reversal magnetization state, in which a “curling”-type model of nanowire behavior is realized.|
|Appears in Collections:||Публикации в зарубежных изданиях|
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