Research

Influence of magnet size on magnetically engineered field-induced superconductivity


Reference:

Gillijns, W., Miloševic, M. V., Silhanek, A. V., Moshchalkov, V. V. and Peeters, F. M., 2007. Influence of magnet size on magnetically engineered field-induced superconductivity. Physical Review B, 76 (18), 184516.

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Official URL:

http://link.aps.org/doi/10.1103/PhysRevB.76.184516

Abstract

We investigate experimentally and theoretically the superconducting properties of an Al thin film covering a periodic array of Co/Pt magnetic disks with out-of-plane magnetization for different radii of the magnetic disks and constant period of the magnetic lattice. The presence of the arrays of magnetic dots leads to a quantized displacement of the normal/superconducting phase boundary along the magnetic field axis, with each step corresponding to a flux-quantum per unit cell of the magnetic lattice. We demonstrate that this so-called field-induced superconductivity is strongly dependent not only on the chosen magnetic material and its magnetization M but also on the radius R of the constructed magnetic disks. Since field-induced superconductivity is directly linked to the nucleation of vortex-antivortex (V-AV) pairs, a theoretical M-R equilibrium phase boundary is presented, delimiting regions of different numbers of induced V-AV pairs per magnet. A good qualitative and quantitative agreement is found between theory and experiment.

Details

Item Type Articles
CreatorsGillijns, W., Miloševic, M. V., Silhanek, A. V., Moshchalkov, V. V. and Peeters, F. M.
DOI10.1103/PhysRevB.76.184516
DepartmentsFaculty of Science > Physics
RefereedYes
StatusPublished
ID Code8654
Additional InformationID number: ISI:000251326700105

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