High coercivity and giant magnetoresistance of CoAg, CoCu granular films

Hiep, Vuong Van; Chau, N.; Hong, D.M.; Luong, Nguyen Hoang

doi:10.1016/j.jmmm.2006.11.136

Cited by 21 publications

(5 citation statements)

References 4 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is also worthy to mention that the GMR values reported here are higher than those published in previous works dealing with electrodeposited Co−Ag granular films. , Moreover, these values are even higher than those published in recent studies in which physical methods such as RF sputtering were employed but lower than other physical methods …”

Section: Discussioncontrasting

confidence: 75%

Relevant GMR in As-Deposited Co−Ag Electrodeposits: Chronoamperometric Preparation

2010

View full text Add to dashboard Cite

Electrodeposited Co-Ag granular films were prepared by potentiostatic deposition from a chloride-based electrolyte. Different Co(II)/Ag(I) ratios were tested to study the influence of the composition bath on the magnetotranport properties. All as-deposited samples showed GMR effect because both longitudinal and transverse magnetoresistances were negative in the whole field range. GMR values up to 5.85% were measured at room temperature. Electrochemical and structural techniques (XRD, TEM, and electron diffraction) as well as magnetoresistance measurements confirmed the heterogeneity of the deposits with a size distribution from superparamagnetic to ferromagnetic particles. Fcc-Ag and a mixture of hcp-Co and fcc-Co were present in the coatings. An analysis of the magnetotransport properties based on the decomposition of the total magnetoresistance into its ferromagnetic and superparamagnetic contributions revealed a high superparamagnetic contribution in all samples.

show abstract

Section: Discussioncontrasting

confidence: 75%

Relevant GMR in As-Deposited Co−Ag Electrodeposits: Chronoamperometric Preparation

2010

View full text Add to dashboard Cite

show abstract

“…The GMR values obtained from our experimental conditions were practically double than those reported for electrodeposited Co-Ag granular films [11,12]. Moreover, these GMR values were even higher than those reported by some authors on the physical deposition of the system [13,14].…”

Section: Introductioncontrasting

confidence: 69%

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

García-Torres¹,

Vallés²,

Gómez³

2010

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

“…The value R(H!0) was obtained by extrapolating the dependences R(H) from a few kilo-Oersteds to zero field. The dependences MR(H) have a common form typical of granular and multilayer structures ferromagnet-normal metal with different composition (Co-Ag, 15 Co-Cu, 8 Co/Cu, 9,13 Ni-Cu/Cu, 14 Co/Ag (Ref. 19)).…”

Section: Resultsmentioning

confidence: 99%

“…[7][8][9][10][11][12] The presence of clusters is especially typical for films containing layers Cu(111). The resistance of layered structures [Co/Cu(111)] changes in a magnetic field similar to the change of resistance of granular Co in the matrix of Cu, 13,14 Ag, 15 Au. 16 Even in high-quality films prepared by molecular epitaxy in a high vacuum, the main contribution to the magnetoresistance effect is the scattering of electrons on SPM clusters rather than on the antiferromagnetic exchange-coupled layers of Co. 12 The latter contribution is often only a few percent of the total magnetoresistive effect.…”

mentioning

confidence: 95%

Reduction of superparamagnetic clusters in the [Co/Cu(111)]n nanofilms, induced by the quantum size effect

Lukienko

Kharchenko

Khrustalev

et al. 2012

Low Temperature Physics

View full text Add to dashboard Cite

It is known that the quantum size effects are important for the formation of morphological properties of metal films. The regularities in the behavior of the superparamagnetic magnetoresistive effect in multilayer nanofilms Co/Cu(111) in a magnetic field, found in the work, indicate the influence of the electron size effect on the formation of clusters in these films. The results of measurements of the high-field magnetoresistive effect are reported for multilayer films [Co/Cu(111)]20 with a constant thickness of cobalt layers and the thickness of copper layer varying from film to film. It is found that an effective size of superparamagnetic formations is reduced in the films with thickness of the copper layers corresponding to the maxima of the antiferromagnetic exchange coupling between cobalt layers. It is suggested that the observed “grinding” of superparamagnetic particles is caused by oscillating changes in the electron density in the interface layer Co/Cu, induced by electron quantum size effect in the copper layers.

show abstract

High coercivity and giant magnetoresistance of CoAg, CoCu granular films

Cited by 21 publications

References 4 publications

Relevant GMR in As-Deposited Co−Ag Electrodeposits: Chronoamperometric Preparation

Relevant GMR in As-Deposited Co−Ag Electrodeposits: Chronoamperometric Preparation

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

Reduction of superparamagnetic clusters in the [Co/Cu(111)]n nanofilms, induced by the quantum size effect

Contact Info

Product

Resources

About