Spin-dependent transport in nanocomposite C:co films

Abstract

The magneto-transport properties of nanocomposite C:Co (15 and 40 at.% Co) thin films are investigated. The films were grown by ion beam co-sputtering on thermally oxidized silicon substrates in the temperature range from 200 to 500°C. Two major effects are reported: (i) a large anomalous Hall effect amounting to 2 lX cm, and (ii) a negative magnetoresistance. Both the field-dependent resistivity and Hall resistivity curves coincide with the rescaled magnetization curves, a finding that is consistent with spin-dependent transport. These findings suggest that C:Co nanocomposites are promising candidates for carbon-based Hall sensors and spintronic devices.

Shape control of nickel nanostructures incorporated in amorphous carbon films: From globular nanoparticles toward aligned nanowires

“…The nc-Me/C films based on metals of this category are in general considered as good candidates for protective coating applications. 2,3,7-16 (ii) Metals with low affinity to carbon such as cobalt [22][23][24][25][26][27][28][29][30][31][32] and nickel. [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] Such ferromagnetic metals can form a soft and thermodynamically unstable metal carbide compounds.…”

“…The nc-Me/C films based on such metals are in most of cases considered for studies due to the special magnetic properties of the ferromagnetic metals which make of this films suitable candidates for magnetic recording media applications. [22][23][24]29,33,36,44 In addition to their interesting magnetic behavior, several recent studies have demonstrated that this class of materials is quite interesting for the development of piezoresistive devices such as strain-gauge. 40,41 (iii) Metals non miscible with carbon such as platinum, 43,50 gold, 50 and copper.…”

Bulk diffusion induced structural modifications of carbon-transition metal nanocomposite films

“…Among nanocomposite films, carbon: transition metal (C:TM) nanocomposite films possess a combination of properties that make them promising candidates for sensors, 2,3 high-density magnetic recording media, 4-10 spintronic devices, 11,12 low-friction solid lubricants, hard wear-resistant coatings 10,[13][14][15][16][17][18][19] or as carbon-based plasma-facing materials for fusion reactors. 1 They are advanced functional materials whose mechanical, electrical, optical, and structural properties cannot be predicted from the properties of the individual components alone, but strongly depend on the composite structure.…”

“…1 This is mainly associated with the high surface to volume ratio of the nanometer sized phase resulting in many interfaces between the constituent phases. Alternatively, the carbon matrix can be amorphous, 6,12,18,24 graphitelike with graphene layers curved into a cylindrical shape encapsulating elongated nanoparticles, [6][7][8][9][10][11][12][13]22,24 and fullerenelike with a spherical-like curvature encapsulating globular nanoparticles. 20 The structure of C:TM nanocomposite films consists of metal-rich nanoparticles embedded in a carbon matrix.…”

Magnetic and electrical transport properties of co-sputtered FexCu100−x composite films

“…Nanocomposite films consisting of ferromagnetic nanoparticles embedded in a nonmagnetic matrix have been paid much attention due to its interesting properties originating from the finite-size and interface effects [1][2][3][4][5]. The giant magnetoresistance (GMR) has been observed in the heterogeneous magnetic nanostructures composed of magnetic and nonmagnetic metals, such as magnetic multilayers [6][7][8], spin valves [9] and nanocomposite films [10,11].…”