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Vortex State Suppression in a Hexagonal Array of Interacting Py Triangular Rings

100%

Spizzo F., Patrignani L., Bisero D., Vavassori P., Metlushko V.

Acta Physica Polonica A

2013

vol. 123

issue 2

218-220

We investigate the effect of magnetostatic interactions on the magnetization reversal process of equilateral triangular rings arranged on a hexagonal lattice. Inter-ring interactions originate as rings corners host domain-walls that produce an intense dipolar field; the effect of such interactions is studied by recording hysteresis loops for different magnetic field orientations. Rings magnetic configuration is probed via magnetic force microscopy and diffraction magneto-optic Kerr effect measurements. We observe that the effect of stray fields due to domain-walls competes with that of shape anisotropy, and that the former prevails when the magnetic field orientation is parallel to rings symmetry axes.

FEBID fabrication and magnetic characterization of individual nano-scale and micro-scale Co structures

86%

Idigoras O., Nikulina E., Porro J. M., Vavassori P., Chuvilin A., Berger A.

Nanofabrication

2014

vol. 1

issue 1

This work gives an illustration of the viability of FEBID to fabricate magnetic nano- and micro-structures and it demonstrates that by means of a combination of MOKE microscopy and MFM, one is able to analyze the size and shape effects in individual magnetic cobalt structures. With the help of our magnetic and functional study, we are able to demonstrate that by using FEBID, cobalt of uniform thickness and magnetic response can be deposited over several micron-size areas, establishing a most crucial ingredient of reliable structure and device fabrication. Furthermore, we show the suitability of FEBID to fabricate functional and complex 3-dimensional magnetic structures. The issue of unintended secondary deposits in FEBID is discussed, and a Xe-ion milling posttreatment for its removal is proposed and demonstrated as a successful pathway towards the fabrication of functionally independent magnetic nano-structures.

Arrays of Metal Nanostructures Produced by Focussed Ion Beam

73%

Luches P., di Bona A., Contri S., Gazzadi G., Vavassori P., Albertini F., Casoli F., Nasi L., Fabbrici S., Valeri S.

Acta Physica Polonica A

2007

vol. 112

issue 6

1297-1312

We present a study of the magnetic properties of arrays of nanostructures produced in a focussed ion beam-scanning electron microscope dual beam system. The single magnetic units have been isolated either by direct removal of parts of the metallic film or by local modification of the film magnetic properties. The final quality of the shape and the residual damage strictly depend on beam parameters (spot size and pixel dwell time) and on the swelling properties of the patterned materials. On square Fe(001) elements with a well-defined intrinsic (magnetocristalline) and shape- and size- Łinebreak -induced (shape plus configurational) anisotropy we show that the overall magnetic anisotropy is not a mere superposition of the individual contributions. We also demonstrate that with ion irradiation doses below the milling threshold L1_0 FePt films with perpendicular magnetic anisotropy undergo a transition from the magnetically hard L1_0 phase to the magnetically soft A1 phase leading to an out-of-plane to in-plane spin reorientation. The magnetic properties of the planar arrays obtained by local modification of the film are compared to arrays of sculpted structures of the same material.

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2 Acta Physica Polonica A

1 Nanofabrication

1 2014

1 2013

1 2007

3 Vavassori P.

1 Albertini F.

1 Berger A.

1 Bisero D.

1 Casoli F.

1 Chuvilin A.

1 Contri S.

1 Fabbrici S.

1 Gazzadi G.

1 Idigoras O.

1 Luches P.

1 Metlushko V.

1 Nasi L.

1 Nikulina E.

1 Patrignani L.

1 Porro J. M.

1 Spizzo F.

1 Valeri S.

1 di Bona A.

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Vortex State Suppression in a Hexagonal Array of Interacting Py Triangular Rings

FEBID fabrication and magnetic characterization of individual nano-scale and micro-scale Co structures

Arrays of Metal Nanostructures Produced by Focussed Ion Beam