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11.
Combining hard and soft magnetic phases by mechanical mixing
Blaž Belec, Cesar De Jilian Fernandez, Daniela Bertoni, druga izvedena dela

Najdeno v: ključnih besedah
Povzetek najdenega: ...Magnetic materials Magnetodipolar interactions lorenz microscopy...
Ključne besede: Magnetic materials Magnetodipolar interactions lorenz microscopy
Objavljeno: 12.02.2019; Ogledov: 2228; Prenosov: 0

12.
Ultrafast Element-Specific Demagnetization in Alloys
Jurij Urbančič, doktorska disertacija

Opis: The study of magnetism has long been an active area of interest for the scientific research, while also providing vast technological applications such as information storage. It was first observed in the middle of the 90s that irradiating a ferromagnetic material with an intense femtosecond laser pulse can result in a loss of magnetization occurring below one picosecond. Since then, the study of magnetism on these femtosecond timescales has been a field of growing interest, addressing the question of how fast can the magnetization modification occurs and what presents the fundamental limit of this speed. For the understanding of these experimental observations, a number of different models were proposed, although the responsible microscopic mechanisms are still under discussion. According to one group of models, the change in magnetic moment is due to the spin-flip mechanism occurring during scattering events between electrons and (quasi-)particles. An example of this is the so-called Microscopic Three-Temperature Model (M3TM). A different approach is employed by the Superdiffusive Spin Current Model, where the loss of magnetization is attributed to a flow of chargeless spin particles taking place after the laser excitation. With the purpose to explore the magnetic characteristic of materials, a range of investigation methods has been developed. One of them relies on the exploitation of the Magneto-Optical Kerr Effect (MOKE) and an incorporation of femtosecond laser pulses in pump-probe configuration. In this way, part of the beam from the same laser system is used to optically excite the system (the pump), while another part takes a snapshot of it (the probe), thus allowing us to investigate the magnetization dynamics with a femtosecond temporal resolution. In the experimental part of the thesis, we apply this MOKE technique to explore the demagnetization dynamics of a ferromagnetic alloy consisting of iron and nickel, also called Permalloy. It is observed that the magnetization is suppressed (quenched) in the first few hundred femtoseconds. Part of the experiments were performed using visible light with different fluences of the pump. The most notable observation is that this alloy exhibits different demagnetization dynamics at lower and higher fluence. What we see is a transition from one-step (demagnetization followed by a recovery on a much longer timescale) to a two-step (demagnetization followed by another slower demagnetization step) magnetization process occurring with the increment of pump fluence. This behavior is predicted and reproduced by the M3TM, which is applied for a comparison between experiments and theory.
Najdeno v: ključnih besedah
Povzetek najdenega: ...purpose to explore the magnetic characteristic of materials, a range of investigation methods has been...
Ključne besede: High Harmonic Generation, Magnetism, Ultrafast, Materials
Objavljeno: 08.05.2020; Ogledov: 1801; Prenosov: 0
.pdf Polno besedilo (12,06 MB)

13.
The role of non-equilibrium dynamics in photo-induced phase transitions of correlated materials
Jurij Urbančič, 2015, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: We use femtosecond extreme-ultraviolet time- and angle-resolved photoelectron spectroscopy to study the ultrafast photo-induced suppression of the charge-density wave (CDW) in 1T-TiSe2. In the following non-equilibrium electron dynamics after femtosecond laser excitation, we see that hot-carrier multiplication is the primary driver for the ultrafast CDW suppression. As soon as the optically excited carriers have relaxed to a quasi-equilibrium hot Fermi-distribution electron gas, the CDW suppression stops. Theoretical calculations of the hot-carrier scattering processes and the screening properties further link the carrier multiplication to the observed CDW gap dynamics.
Najdeno v: ključnih besedah
Ključne besede: Correlated Materials, High Harmonic Generation, ARPES
Objavljeno: 22.05.2020; Ogledov: 1543; Prenosov: 0

14.
Element-resolved study on the influence of a magnetic dopant on the exchange interaction in FePt on ultrashort timescales
Jurij Urbančič, 2017, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: In this study, we investigate the optically induced ultrafast demagnetization dynamics of a FePt alloy doped with Mn atoms on the characteristic timescale of the exchange interaction of a few femtoseconds. We use high harmonic generation with photon energies in the XUV to gain elemental resolution in a femtosecond magneto-optical Kerr-effect experiment [1] in transversal geometry. Following up on earlier experiments, which showed the importance of the exchange interaction in the demagnetization process in alloys [2,3], we see clear differences in the dynamical responses of the three elements Fe, Pt, and Mn. Our results suggest, that the exchange coupling between the magnetic moments of the FePt alloy and the Mn dopant changes on ultrashort timescales.
Najdeno v: ključnih besedah
Ključne besede: FePt, High Harmonic Generation, Laser, Magnetic Materials
Objavljeno: 22.05.2020; Ogledov: 1668; Prenosov: 0

15.
16.
Action Learning Sets - EmindS Training Materials
Haris Tsitouras, Dimitrios Doukas, Kirsi Maasalo, Peter Purg, Petroula Mavrkiou, Maria Koutiva, Christiana Knais, univerzitetni, visokošolski ali višješolski učbenik z recenzijo

Najdeno v: ključnih besedah
Ključne besede: action learning, materials, entrepreneurship, interdisciplinary, entrecomp
Objavljeno: 05.01.2021; Ogledov: 982; Prenosov: 0
.pdf Polno besedilo (1003,03 KB)

17.
Paramagnetic intrinsic point defects in alkali phosphate glasses
Nadege Ollier, Luigi Giacomazzi, Nikita S. Shcheblanov, Nicolas Richard, Mikhail E. Povarnitsyn, Shinji Kohara, Matjaž Valant, Layla Martin-Samos, 2021, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...oxygen, electron paramagnetic resonance spectroscopy, phosphates, amorphous materials, defects...
Ključne besede: oxygen, electron paramagnetic resonance spectroscopy, phosphates, amorphous materials, defects
Objavljeno: 04.05.2021; Ogledov: 1037; Prenosov: 0
.pdf Polno besedilo (2,23 MB)

18.
Topological properties and self-energy effects in elemental Yb
L. Petaccia, D. Ceresoli, S. Iacobucci, A. Ruocco, Giovanni Stefani, Luka Novinec, M. I. Trioni, Sandra Gardonio, F. Offi, P. M. Sheverdyaeva, 2021, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...electronic structure, topological materials, lanthanides, angle-resolved photoemission spectroscopy...
Ključne besede: electronic structure, topological materials, lanthanides, angle-resolved photoemission spectroscopy
Objavljeno: 03.12.2021; Ogledov: 455; Prenosov: 11
.pdf Polno besedilo (1,94 MB)
Gradivo ima več datotek! Več...

19.
CHARACTERIZATION OF BIOCOMPOSITE MATERIALS BY PHOTOTHERMAL BEAM DEFLECTION SPECTROMETRY
Chieu D TRAN, Hanna Budasheva, Patricia Cazon Diaz, Dorota Korte, Mladen Franko, prispevek na konferenci brez natisa

Najdeno v: ključnih besedah
Ključne besede: EAM DEFLECTION SPECTROMETRY, BIOCOMPOSITE MATERIALS, porosity
Objavljeno: 02.12.2021; Ogledov: 448; Prenosov: 0
.pdf Polno besedilo (565,99 KB)

20.
Characterization of materials
Blaž Belec, predavanje na tuji univerzi

Najdeno v: ključnih besedah
Ključne besede: materials characterization
Objavljeno: 28.02.2022; Ogledov: 254; Prenosov: 0
.pdf Polno besedilo (760,97 KB)

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