E. Puppin

chapter

Ultrafast electronic and spin dynamics in thin iron films: electron-magnon and electron-phonon interactions

E. Carpene, E. Mancini, C. Dallera, M. Brenna, more

Springer Series in Chemical Physics > Ultrafast Phenomena XVI > Correlated Electron Systems, Magnetization and Spin Dynamics > 206-208

The electronic and spin dynamics in thin iron films have been investigated by means of time-resolved reflectivity and magneto-optical Kerr effect. The electron-magnon and the electron-phonon coupling times are extrapolated and their influence is discussed.

article

Femtosecond laser spectroscopy of spins: Magnetization dynamics in thin magnetic films with spatio-temporal resolution

E. Carpene, E. Mancini, C. Dallera, E. Puppin, more

Thin Solid Films > 2010 > 519 > 5 > 1642-1648

Based on the Magneto-Optical Kerr Effect (MOKE), we have developed an experimental set-up that allows us to fully characterize the magnetization dynamics in thin magnetic films by measuring all three real space components of the magnetization vector M. By means of the pump-probe technique it is possible to extract the time dependence of each individual projection with sub-picosecond resolution. This...

article

Distortions of the statistical distribution of Barkhausen noise measured by magneto-optical Kerr effect

E. Pinotti, M. Brenna, E. Puppin

Journal of Magnetism and Magnetic Materials > 2008 > 320 > 9 > 1651-1656

In magneto-optical Kerr measurements of the Barkhausen noise, a magnetization jump ΔM due to a domain reversal produces a variation ΔI of the intensity of a laser beam reflected by the sample, which is the physical quantity actually measured. Due to the non-uniform beam intensity profile, the magnitude of ΔI depends both on ΔM and on its position on the laser spot. This could distort the statistical...

article

Temperature-dependent magnetism of Fe thin films on ZnSe(001)

M. Cantoni, R. Bertacco, F. Ciccacci, E. Puppin, more

Journal of Magnetism and Magnetic Materials > 2007 > 316 > 2 > e545-e548

We present X-ray magnetic circular dichroism (XMCD) and magneto-optical Kerr effect (MOKE) data on the magnetic properties of Fe/ZnSe(001) thin films at increasing Fe coverage. The magnetic behaviour of the Fe overlayer is superparamagnetic for a coverage up to 6 monolayers whereas, above this threshold, a truly ferromagnetic phase shows up. XMCD and MOKE data show that this behaviour is substantially...

article

Surface crystallization and frequency dependence of AC coercivity in Fe80B20 amorphous alloy

P. Vavassori, F. Ronconi, M. Traldi, E. Puppin

Journal of Magnetism and Magnetic Materials > 1998 > 177-181 > Part 1 > 127-128

We report here, for the first time, the results of a study of the frequency dependence of coercivity (H _c (ƒ)) at the surface of amorphous and partially crystallized Fe ₈₀ B ₂₀ samples with different degrees of crystallization. H _c (ƒ) shows a shape which does not depend on either the surface or bulk structure (i.e. crystalline or amorphous), consisting of a nearly...

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Surface magnetic characterization of FeB amorphous ribbons

P. Vavassori, L. Callegaro, E. Puppin, F. Malizia, more

Journal of Magnetism and Magnetic Materials > 1996 > 157-158 > Complete > 171-172

We report longitudinal Kerr hysteresis loops of the two surfaces of a Fe ₈₀ B ₂₀ amorphous melt-spun ribbon. We observe different magnetic properties on the two sides. The results could be explained as being due to the presence of surface inhomogeneities having particular shapes, which induces high anisotropy, and to the bulk underlying magnetic domain structure which strongly interacts...

article

Magnetic properties of electroplated CoPt films

G. Zangari, P. Bucher, N. Lecis, P.L. Cavallotti, more

Journal of Magnetism and Magnetic Materials > 1996 > 157-158 > Complete > 256-257

We have electrodeposited CoPt films of different composition and thickness containing several percent of phosphorous. Very high coercivities (up to 5500 Oe) have been obtained at 70–80 at% Co. Coercivity lowers for higher Pt content. A clear correlation is observed between H _c and structural properties.

article

Electroplated, high H _c CoPt films: δM magneto-optical measurements

L. Callegaro, E. Puppin, P.L. Cavallotti, G. Zangari

Journal of Magnetism and Magnetic Materials > 1996 > 155 > 1-3 > 190-192

Co-rich CoPt and CoPtP alloy thin films were obtained by electrodeposition. Addition of a P compound to the electrolyte for CoPt deposition induces P codeposition and improves film hard magnetic properties, reaching coercive farces up to 5500 Oe, with S ^* = 0.7. To understand the effect of P compound addition, a macroscopic characterization of intergrain interactions in CoPt and CoPtP films...

article

Monte Carlo simulation of inelastic background in direct and inverse photoemission

E. Puppin, E. Ragaini

Journal of Electron Spectroscopy and Related Phenomena > 1995 > 73 > 1 > 53-58

A simple model is described which allows the inelastic background in direct and inverse photoemission spectra to be simulated. The basic physical approximations of the model are described, and the flow diagrams of the Monte Carlo algorithms are presented. The input parameters of the simulation program are the electron inelastic mean free path and the loss function. In order to illustrate the possibilities...

article

Ultraviolet inverse photoemission study of the oxidation of YFe ₂

P. Vavassori, L. Callegaro, E. Puppin

Applied Surface Science > 1995 > 89 > 1 > 93-96

The evolution of the empty valence-electron states of a polycrystalline YFe ₂ sample upon oxidation at room temperature is studied with inverse photoemission spectroscopy in the photon energy range 10-20 eV. The analysis of the oxidized spectra shows a progressive localization of the d-states upon oxidation and allows the roles of Y and Fe in the oxidation process to be addressed. These results...

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Search results for: E. Puppin

Ultrafast electronic and spin dynamics in thin iron films: electron-magnon and electron-phonon interactions

Femtosecond laser spectroscopy of spins: Magnetization dynamics in thin magnetic films with spatio-temporal resolution

Distortions of the statistical distribution of Barkhausen noise measured by magneto-optical Kerr effect

Temperature-dependent magnetism of Fe thin films on ZnSe(001)

Surface crystallization and frequency dependence of AC coercivity in Fe80B20 amorphous alloy

Surface magnetic characterization of FeB amorphous ribbons

Magnetic properties of electroplated CoPt films

Electroplated, high H _c CoPt films: δM magneto-optical measurements

Monte Carlo simulation of inelastic background in direct and inverse photoemission

Ultraviolet inverse photoemission study of the oxidation of YFe ₂

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