Anisotropic magnetoresistance in electrodeposited cobalt antidot arrays

Spada, Edna R.; Pereira, Guilherme M.; Jasinski, Éverton Fabian; Rocha, Alexsandro Silvestre da; Schilling, Osvaldo F.; Sartorelli, M. L.

doi:10.1016/j.jmmm.2008.02.057

Cited by 11 publications

(7 citation statements)

References 10 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the wide diversity of the size of particles does not facilitate comparisons. For example, Spada et al 53 announced homogeneous bidimensional colloidal mask (496-nm-diameter PS nanospheres) reaching areas up to 0.5 cm 2 . However, many defects were present in the monolayer, and we estimated the defect-free area to ∼80 μm 2 .…”

Section: ' Introductionmentioning

confidence: 99%

Experimental Design Applied to Spin Coating of 2D Colloidal Crystal Masks: A Relevant Method?

2011

View full text Add to dashboard Cite

Monolayers of colloidal spheres are used as masks in nanosphere lithography (NSL) for the selective deposition of nanostructured layers. Several methods exist for the formation of self-organized particle monolayers, among which spin coating appears to be very promising. However, a spin coating process is defined by several parameters like several ramps, rotation speeds, and durations. All parameters influence the spreading and drying of the droplet containing the particles. Moreover, scientists are confronted with the formation of numerous defects in spin coated layers, limiting well-ordered areas to a few micrometers squared. So far, empiricism has mainly ruled the world of nanoparticle self-organization by spin coating, and much of the literature is experimentally based. Therefore, the development of experimental protocols to control the ordering of particles is a major goal for further progress in NSL. We applied experimental design to spin coating, to evaluate the efficiency of this method to extract and model the relationships between the experimental parameters and the degree of ordering in the particles monolayers. A set of experiments was generated by the MODDE software and applied to the spin coating of latex suspension (diameter 490 nm). We calculated the ordering by a homemade image analysis tool. The results of partial least squares (PLS) modeling show that the proposed mathematical model only fits data from strictly monolayers but is not predictive for new sets of parameters. We submitted the data to principal component analysis (PCA) that was able to explain 91% of the results when based on strictly monolayered samples. PCA shows that the ordering was positively correlated to the ramp time and negatively correlated to the first rotation speed. We obtain large defect-free domains with the best set of parameters tested in this study. This protocol leads to areas of 200 μm(2), which has never been reported so far.

show abstract

Section: ' Introductionmentioning

confidence: 99%

Experimental Design Applied to Spin Coating of 2D Colloidal Crystal Masks: A Relevant Method?

2011

View full text Add to dashboard Cite

show abstract

“…Canted shape of M(H) hysteresis loop is reported for thicker film (180 nm) and is attributed to stripe domain structure which is composed of many fine magnetic domain structures [4]. However, formation of single domain structure was confirmed through rectangular shaped M(H) curves observed for samples S3 and S4 and generally observed for thinner films [4] and nano-wires [3]. Therefore, magnetization data indirectly confirm the grain growth reduction with oxygen partial pressure as observed in our XRD data.…”

Section: Resultsmentioning

confidence: 88%

“…The magnetic properties of nano-scale structures, such as single nano-wire [1], array of nano-wires [2,3] and antidot arrays of circular [4], square and rectangular shape [5], have attracted both scientific and technological interest due to advances in lithographic and other controlled fabrication techniques. As the magnetic length scale, such as domain wall width ðd w Þ, exchange length (l) is comparable to the grain size, dramatic changes in the magnetic properties are observed.…”

Section: Introductionmentioning

confidence: 99%

“…As the magnetic length scale, such as domain wall width ðd w Þ, exchange length (l) is comparable to the grain size, dramatic changes in the magnetic properties are observed. Anisotropic magnetoresistance (AMR) measurements were found as one of the key techniques to investigate the magnetic properties of arrays of isolated nanostructure of the magnetic materials [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Role of oxygen impurity in growth and magnetic properties of Ni83Fe17 permalloy thin films

Chowdhury

Barshilia

Rajam

et al. 2010

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

“…The canted shaped M(H) curves are attributed due to strip domain structures which are composed of many fine magnetic domain structures [3]. However, the rectangular shaped M(H) curves observed at 150 and 200 o C confirmed the formation of single domain structures in the thin films, which are generally observed in thinner films [3] and nanowires [1] . The developed Ni 81 Fe 19 thin film (thickness = 50nm) having Ta as a buffer layer (thickness = 10nm) was used for the AMR sensor development.…”

Section: Resultsmentioning

confidence: 90%

Development of magnetoresistive thin film sensor for magnetic field sensing applications

Chowdhury¹

2013

AIP Conference Proceedings

View full text Add to dashboard Cite

Note: Reducing polarization induced sidebands in Rayleigh backscattering spectra for accurate distributed strain measurement using optical frequency-domain reflectometry Rev. Sci. Instrum. 84, 026101 (2013) Spatially and frequency-resolved monitoring of intradie capacitive coupling by heterodyne excitation infrared lockin thermography Appl. Phys. Lett. 102, 054103 (2013) Design and performance evaluation of polyvinyl alcohol/polyimide coated optical fibre grating-based humidity sensors Rev. Sci. Instrum. 84, 025002 (2013) Designing an optical set-up of differential laser triangulation for oil film thickness measurement on water Rev. Sci. Instrum. 84, 013105 (2013) Note: Simultaneous measurement of transverse speed and axial velocity from a single optical beam Rev. Sci. Instrum. 84, 016110 (2013) Additional information on AIP Conf. Proc.Abstract. Recently, nano-dimensional magnetic thin film and multilayer structures have attracted a great deal of interest due to the possibility of unique and desirable magnetic properties. Our research into magnetic thin films is primarily focused on the growth and properties of such structures on Si to develop the magnetic sensors for field sensing applications. Thin films of permalloy (Ni 81 Fe 19 ) were deposited on silicon substrates using Ultra High vacuum (UHV) sputtering system ( ~ 5 x 10 -9 mbar). To achieve the negligible hysteresis and high thermal stability of these films, the magnetic and structural properties were optimized by (1) varying thicknesses of magnetic films, and (2) post annealing at various temperatures. Optimized films were then patterned to study the device output characteristics to know about their sensitivity and we achieve the sensitive of the order 45 µV/G/V which is equivalent to any commercially available magnetic sensors. These anisotropic magnetoresistive (AMR) based sensors are very useful for further development of navigation compass to use in strategic sectors for the self reliance of our country.

show abstract

Anisotropic magnetoresistance in electrodeposited cobalt antidot arrays

Cited by 11 publications

References 10 publications

Experimental Design Applied to Spin Coating of 2D Colloidal Crystal Masks: A Relevant Method?

Experimental Design Applied to Spin Coating of 2D Colloidal Crystal Masks: A Relevant Method?

Role of oxygen impurity in growth and magnetic properties of Ni83Fe17 permalloy thin films

Development of magnetoresistive thin film sensor for magnetic field sensing applications

Contact Info

Product

Resources

About