Temperature dependence of GMR and effect of annealing on electrodeposited Co–Ag granular films

García-Torres, José; Vallés, E.; Gómez, Elvira

doi:10.1016/j.jmmm.2010.05.058

Cited by 22 publications

(7 citation statements)

References 19 publications

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“…Due to this problem, numerous superlattices and thin films based on magnetic/non-magnetic [1][2][3] and insulator/magnetic [4][5][6] components have been studied. The main M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT difficulties of such materials are integration into a semiconductor technology and small mean free path of the carriers.…”

Section: Introductionmentioning

confidence: 99%

Composites based on self-assembled MnAs ferromagnet nanoclusters embedded in ZnSnAs2 semiconductor

Федорченко

Kilański

Zakharchuk

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Composites based on self-assembled MnAs ferromagnet nanoclusters embedded in ZnSnAs2 semiconductor

Федорченко

Kilański

Zakharchuk

et al. 2015

Journal of Alloys and Compounds

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“…Alternatively, we may also consider coalescence of small Co particles locally giving rise to larger paricles. 18 These particles are now in blocked state and behave as FM particles. The presence of FM particles and AMR at 300 K now may be linked to the appearance of perpendicular magnetic anisotropy in 32.6% film.…”

Section: Resultsmentioning

confidence: 99%

Perpendicular magnetic anisotropy and complex magnetotransport behavior of cobalt nanoparticles in silver matrix

Kumar

Chaudhary

Pandya

2015

Journal of Applied Physics

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“…In [20], it was shown that heat treatment of film samples is necessary for homogenization of granular solid solution. In addition, the optimal size of the granules, at which the granular film will have the maximum value of GMR [20], can be achieved by heat treatment. This can be attained by choosing the temperature and annealing time.…”

Section: Magnetoresistive and Magnetic Propertiesmentioning

confidence: 99%

Magnetic and Magnetoresistive Properties of Thin Film Alloys Based on Cobalt and Copper

Shpetnyi¹

2020

J. Nano- Electron. Phys.

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This work presents the results of a study of the influence of dimensional and concentration effects on magnetoresistive and magnetic properties and structural-phase state of annealed at Ta  700 K samples of thin film alloys based on Co and Cu with thickness d  40 nm in a wide range of total concentrations of Co (18 ≤ cCo ≤ 69 at. %). The samples were obtained by the method of co-evaporation in vacuum using two independent electron guns. It was found that samples of thin film alloys with a total concentration of cobalt cCo ≤ 22 at. % are characterized mainly by a superparamagnetic state in which hcp-Co granules with size L  5÷12 nm were placed in a matrix of Cu(Co) solid solution (s.s.) based on fcc-Cu. The increase in the total concentration of Co in thin film alloys to cCo  37 at. % led to an increase in the size of the magnetic granules to L  7÷20 nm and a decrease in the distance between them. In samples of thin film alloys with a cobalt concentration of 56 ≤ cCo ≤ 69 at. %, hcp-Co granules with size L  8÷25 nm were combined into ferromagnetic clusters, and the volume between the clusters was filled with fcc-Cu(Co) s.s.. The maximum giant magnetoresistance (GMR) values, measured in an external magnetic field Hmax  15 kOe at room temperature, were obtained for a sample with a total concentration of cobalt cCo  22 at. %. The amplitude of GMR values was 3.8 % and 4.1 % in the perpendicular and longitudinal measurement geometries, respectively. Thin film alloys with a total cobalt concentration of 18 ≤ cCo ≤ 22 at. % were characterized by isotropic magnetoresistance. The increase in the total concentration of cobalt in thin film alloys to cCo ≥ 28 at. % led to the emergence of magnetic anisotropy and anisotropic magnetoresistance. This may be due to the appearance of ferromagnetic interactions between cobalt granules. Low-temperature measurements of magnetoresistance at Тmeas  5 K of the sample with a total cobalt concentration cCo  18 at. % showed an increase in the amplitude of GMR by 2.1 times (GMR  11.1 %) compared with the amplitude of GMR  5.18 % measured at room temperature in an external magnetic field Hmax  90 kOe. With increasing measurement temperature to T  350 K the amplitude of GMR decreased and amounted to 4.5 %. This is due to the increase in electron scattering by phonons with increasing temperature.

show abstract

Temperature dependence of GMR and effect of annealing on electrodeposited Co–Ag granular films

Cited by 22 publications

References 19 publications

Composites based on self-assembled MnAs ferromagnet nanoclusters embedded in ZnSnAs2 semiconductor

Composites based on self-assembled MnAs ferromagnet nanoclusters embedded in ZnSnAs2 semiconductor

Perpendicular magnetic anisotropy and complex magnetotransport behavior of cobalt nanoparticles in silver matrix

Magnetic and Magnetoresistive Properties of Thin Film Alloys Based on Cobalt and Copper

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