Structural and Magnetic Properties of Various Ferromagnetic Nanotubes

Abstract

The structural and magnetic properties of ferromagnetic nanotubes fabricated by a low cost electrodeposition method are investigated. The fabrication of various elemental ferromagnetic materials are described, such as Fe, Co, and Ni, and ferromagnetic alloys, such as NiFe, CoPt, CoFeB, and CoCrPt nanotube arrays, in aluminum oxide templates and polycarbonate membranes with different diameters, wall thicknesses, and lengths. The structural, magnetic, and magnetization reversal properties of these nanotubes are investigated as a function of the geometrical parameters. The angular dependence of the coercivity indicates a transition from the curling to the coherent mode for the ferromagnetic nanotubes. The results show that nanotube fabrication allows the outer and inner diameter, length, and thickness of the nanotubes to be tuned systematically. The magnetization processes of ferromagnetic nanotubes are influenced by the wall thickness.

Template Synthesis and Magnetic Characterization of Feni Nanotubes

“…In general, the process of electrochemical depositing of metal into the pores of the templates consists of 4 main steps: nucleation, active 1D growth, formation of "caps" on the surface of template and forming a continuous metal thin film on the surface of the template by overlap of the "caps" [30][31][32][33][34][35]. Chronoamperogramm is shown on Figure 1(a).…”

Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance

“…Plasmonic and SERS sensing applications, for example, are surface based, and hollow structures with large surface-area-to-volume ratios may lead to stronger signal generation and higher sensitivity 14,15,32 . With respect to this, gold nanotubes have been synthesized from various methods including galvanic replacement reactions on silver nanorods 33 , electroless plating 34,35 , surface modification of the template pores 36,37 , sol-gel methods 38 , and electrodeposition [39][40][41] . These syntheses typically leave poorly formed, porous nanotubes or allow for little control over the size and morphology.…”

Template-based synthesis and discontinuous hysteresis loops of cobalt nanotube arrays

“…Ferromagnetic nanotubes have drawn special attention in recent years because their magnetic anisotropy and magnetic reversal mechanism are much different from those of nanowires [6][7][8][9][10]. Ferromagnetic Co nanotubes have single axis magnetic anisotropy, which makes them a promising material for future applications in magnetic sensors and ultrahigh density magnetic recording.…”