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Composition and Temperature Dependence of Giant Magnetoresistance in Melt-Spun Co_{x}Cu_{100-x} Ribbons

100%

Idzikowski B., Nenkov K., Handstein A., Hütten A., Müller K.-H.

Acta Physica Polonica A

1997

vol. 92

issue 2

307-310

Structure, magnetic properties and magnetoresistance in as-quenched and annealed Co_{x}Cu_{100-x} samples were investigated. Homogeneous metastable Co_{x}Cu_{100-x} alloys were prepared by the single-roller technique. The maximum value of magnetoresistance is shifted to higher annealing temperatures with increasing measuring temperature. At higher measuring temperatures the magnetoresistance is not saturated in fields as high as 16 T. Susceptibility measurements showed the formation of hcp-structured Co clusters. For small cobalt concentrations there is a transition from giant magnetoresistance to the normal anisotropic magnetoresistance.

Efficient Calculation of Low Energy Configurations of Nanoparticle Ensembles for Magnetoresistive Sensor Devices by Means of Stochastic Spin Dynamicsand Monte Carlo Methods

86%

Teich L., Schröder C., Müller C., Patel A., Meyer J., Hütten A.

Acta Physica Polonica A

2015

vol. 127

issue 2

374-376

We present results of Monte Carlo and stochastic spin dynamics simulations of a magnetic nanoparticle model system based on experimentally produced samples. Thermodynamic investigations as well as spin dynamics studies show characteristic features, both resembling magnetic dipole glass behaviour. While spin dynamics studies at T=0 yield a multitude of low energy configurations, thermodynamic simulations show a clear transition between a paramagnetic and a frozen magnetic state. Moreover, we demonstrate the application of experimentally inspired demagnetization protocols to compute low energy configurations of the systems under consideration efficiently.

From Magnetic Nanoparticles to Magnetoresistive Biosensors

59%

Ennen I., Albon C., Weddemann A., Auge A., Hedwig P., Wittbracht F., Regtmeier A., Akemeier D., Dreyer A., Peter M., Jutzi P., Mattay J., Mitzel N., Mill N., Hütten A.

Acta Physica Polonica A

2012

vol. 121

issue 2

420-425

This paper highlights recent advances in synthesis and magnetotransport properties of magnetic Co nanoparticles. It is shown that magnetic Co nanoparticles self-assembled in nanoparticular monolayers revealing giant magnetoresistance similar to granular systems but with additional features resulting from dipolar interactions between small domains of nanoparticles. A spin-valve with one magnetic Co nanoparticular electrode is employed as a model to demonstrate that individual magnetic moments of Co nanoparticles can be coupled to a magnetic Co layer which in turn offers tailoring of the resulting giant magnetoresistance characteristics. In addition, it is demonstrated that combining a magnetic on-off ratchet with magnetic tunneling junctions integrated in the ratchet introduces a new biosensor concept enabling: (1) simultaneous transporting and separating biomolecules, (2) dynamical biomolecule detection when passing magnetic tunneling junctions in a 1D arrangement. It is projected that this biosensor concept could be applied for viruses as well as for bacteria.

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3 Acta Physica Polonica A

1 2015

1 2012

1 1997

3 Hütten A.

1 Akemeier D.

1 Albon C.

1 Auge A.

1 Dreyer A.

1 Ennen I.

1 Handstein A.

1 Hedwig P.

1 Idzikowski B.

1 Jutzi P.

1 Mattay J.

1 Meyer J.

1 Mill N.

1 Mitzel N.

1 Müller C.

1 Müller K.-H.

1 Nenkov K.

1 Patel A.

1 Peter M.

1 Regtmeier A.

1 Schröder C.

1 Teich L.

1 Weddemann A.

1 Wittbracht F.

Search results

Composition and Temperature Dependence of Giant Magnetoresistance in Melt-Spun Co_{x}Cu_{100-x} Ribbons

Efficient Calculation of Low Energy Configurations of Nanoparticle Ensembles for Magnetoresistive Sensor Devices by Means of Stochastic Spin Dynamicsand Monte Carlo Methods

From Magnetic Nanoparticles to Magnetoresistive Biosensors