S.F. Contri

University of Modena and Reggio Emilia

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S. Valeri

Campus Bio Medico University Hospital

Gian Carlo Gazzadi

Istituto Nanoscienze

A. di Bona

Istituto Nanoscienze

P. Luches

Istituto Nanoscienze

P. Vavassori

Ikerbasque

S. Cottafava

University of Modena and Reggio Emilia

L. Nasi

Institute of Materials for Electronics and Magnetism

S. Fabbrici

Institute of Materials for Electronics and Magnetism

S. Altieri

University of Modena and Reggio Emilia

F. Casoli

Institute of Materials for Electronics and Magnetism

Cooperative Institutions

University of Modena and Reggio Emilia

Istituto Nanoscienze

National Research Council

AREA Science Park

Institute of Materials for Electronics and Magnetism

Azienda Unita' Sanitaria Locale Di Modena

Czech Academy of Sciences, Institute of Physics

Russian Academy of Sciences

Physico-Technical Institute

University of Parma

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Local modifications of magnetism and structure in FePt (001) epitaxial thin films by focused ion beam: Two-dimensional perpendicular patterns

Journal of Applied Physics (2008)

F. Albertini L. Nasi F. Casoli S. Fabbrici P. Luches

Focused ion beam was utilized to locally modify magnetism and structure of L10 FePt perpendicular thin films. As a first step, we have performed a magnetic, morphological, and structural study of completely irradiated FePt films with different Ga+ doses (1×1013–4×1016 ions/cm2) and ion beam energy of 30 keV. For doses of 1×1014 ions/cm2 and above a complete transition from the ordered L10 to the disordered A1 phase was found to occur, resulting in a drop of magnetic anisotropy and in the consequent moment reorientation from out-of-plane to in-plane. The lowest effective dose in disordering the structure (1×1014 ions/cm2) was found not to affect the film morphology. Taking advantage of these results, continuous two-dimensional (2D) patterns of perpendicular magnetic structures (250 nm dots, 1 μm dots, 1 μm-large stripes) were produced by focused ion beam without affecting the morphology. The 2D patterns were revealed by means of magnetic force microscopy, that evidenced peculiar domain structures in the case of 1 μm dots.

Magnetism

Magnetic structure

Film plane

10.1063/1.2975217

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Citations (16)

Hydrolysis atMgO(100)∕Ag(100)oxide-metal interfaces studied by

Physical Review B (2007)

S. Altieri S.F. Contri S. Valeri

Using $\mathrm{O}\phantom{\rule{0.2em}{0ex}}1s$ x-ray photoelectron and Mg $K{L}_{23}{L}_{23}$ Auger spectroscopy, we demonstrate that monolayer $\mathrm{Mg}\mathrm{O}(100)∕\mathrm{Ag}(100)$ exposed at $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ to ${\mathrm{H}}_{2}\mathrm{O}$ vapor pressure of ${10}^{\ensuremath{-}8}\phantom{\rule{0.3em}{0ex}}\text{Torr}$ is strongly hydrated up to 0.8 ${\mathrm{H}}_{2}\mathrm{O}$ per MgO formula unit, half of the water molecules being dissociatively adsorbed at the fourfold coordinated surface oxide sites. These dramatic hydrolysis and molecular adsorption phenomena are strikingly different from those observed at perfect bulklike MgO(100) surfaces, and provide strong experimental support to the concept of unprecedented interactions and properties at oxide-metal interfaces.

10.1103/physrevb.76.205413

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Citations (31)

Morphology of H2O dosed monolayer MgO(001)/Ag(001)

Surface Science (2004)

S. Altieri S.F. Contri Stefano Agnoli S. Valeri

Morphology

Auger electron spectroscopy

10.1016/j.susc.2004.06.111

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Citations (17)

Focused ion beam induced swelling in MgO(001)

Surface Science (2006)

A. Rota S.F. Contri Gian Carlo Gazzadi S. Cottafava Enrico Gualtieri

Non-blocking I/O

Morphology

10.1016/j.susc.2006.01.084

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Citations (10)

Swelling process induced by Focused Ion Beam on magnetic layers

A. Rota S.F. Contri Gian Carlo Gazzadi S. Cottafava S. Valeri

Source

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Submicron-scale patterns on ferromagnetic–antiferromagnetic Fe/NiO layers by focused ion beam (FIB) milling

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2005)

Gian Carlo Gazzadi P. Luches S.F. Contri A. di Bona S. Valeri

Dwell time

Non-blocking I/O

10.1016/j.nimb.2004.12.093

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Citations (7)

Initial stages of cobalt film growth on MgO(001) surface

Technical Physics Letters (2005)

I. I. Pronin D. A. Valdaitsev A. S. Voronchikhin M. V. Gomoyunova S.F. Contri

Auger electron spectroscopy

Surface layer

10.1134/1.1969777

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Citations (9)

Magnetic anisotropy engineering in square magnetic elements

Journal of Magnetism and Magnetic Materials (2007)

A. di Bona S.F. Contri Gian Carlo Gazzadi S. Valeri P. Vavassori

Magnetocrystalline anisotropy

Anisotropy energy

Square (algebra)

Crystal (programming language)

10.1016/j.jmmm.2007.02.020

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Arrays of Metal Nanostructures Produced by Focussed Ion Beam

Acta Physica Polonica A (2007)

P. Luches A. di Bona S.F. Contri Gian Carlo Gazzadi P. Vavassori

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--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 L10 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.

10.12693/aphyspola.112.1297

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Citations (6)