Research Topics

Scanning SQUID microscopy


A SQUID (Superconducting Quantum Interference Device) is an extremely sensitive sensor for magnetic flux. Using micro-fabricated SQUID sensors, the Scanning SQUID Microscope presents a powerful scanning probe technique to locally image magnetic fields. We use scanning SQUID microscopy for various studies, such as on the occurrence of ferro-magnetism in novel thin film materials and heterostructures and for the study of fractional vortices occurring in p-phase shift structures employing the d-wave symmetry of the high-Tc superconducting state.

Selected recent & key publications

T. Ortlepp, Ariando, O. Mielke, C.J.M. Verwijs, K.F.K. Foo, H. Rogalla, F.JH. Uhlmann, and H. Hilgenkamp, 'Flip-flopping fractional flux quanta',
Science 312, 1495-1497 (2006).

J.R. Kirtley, C.C. Tsuei, Ariando, C.J.M. Verwijs, S. Harkema, and H. Hilgenkamp, 'Angle-resolved phase-sensitive determination of the in-plane gap symmetry in YBa2Cu3O7', 
Nature Physics 2, 190-194 (2006).

M. Freitag, J.C. Tsang, J. Kirtley, A. Carlsen, J. Chen, A. Troeman, H. Hilgenkamp and P. Avouris, ‘Electrically excited, localized infrared emission from single carbon nanotubes’,
Nano Letters 6, 1425-1433 (2006).

H. Hilgenkamp, Ariando, H.J.H. Smilde, D.H.A. Blank, G. Rijnders, H. Rogalla, J.R. Kirtley and C.C. Tsuei, ‘Ordering and manipulation of the magnetic moments in large-scale superconducting pi-loop arrays’,
Nature 422, 50-53 (2003).

More publications see: List of publications