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INFM-L’AQUILA FILM E MULTISTRATI MAGNETICI Franco Lucari

INFM-L’AQUILA FILM E MULTISTRATI MAGNETICI Franco Lucari. 4/4. UNIVERSITÀ DELL’AQUILA. Film e multistrati magnetici. Il gruppo è composto da: Lucari Franco D’Orazio Franco Continenza Alessandra Utilizza alcuni borsisti oltre a due tecnici: Giammaria Franco Rossi Lorella.

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INFM-L’AQUILA FILM E MULTISTRATI MAGNETICI Franco Lucari

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  1. INFM-L’AQUILAFILM E MULTISTRATI MAGNETICIFranco Lucari 4/4

  2. UNIVERSITÀ DELL’AQUILA • Film e multistrati magnetici

  3. Il gruppo è composto da: Lucari Franco D’Orazio Franco Continenza Alessandra Utilizza alcuni borsisti oltre a due tecnici: Giammaria Franco Rossi Lorella Tematiche di interesse: N. 1 e N. 4 Work packages: WP1, WP3 e WP4 Università dell’Aquila - FIRB

  4. Le apparecchiature in dotazione • Apparato di misura magneto-ottico per misure Faraday, Kerr polare o longitudinale, MCD, MLD: campo magnetico B≤5600 gauss, temperatura 4≤T≤300 K, lunghezza d'onda 0.4≤l≤2.6 mm. • Suscettometro Lakeshore 7030: frequenza 5≤n≤10000 Hz, temperatura 15≤T≤300 K, campo magnetico di misura 0.1≤H≤25 Oe. • Apparato di deposizione per sputtering (magnetron, 3 catodi) • Magnetometro AGFM Princeton Instr., Campo B < 1.4 T • Calcolatori

  5. Apparecchiature a cui è possibile accedere localmente • Diffrazione a raggi X • SEM (TEM?) • XPS • Microscopia a forza atomica • Microscopia a forza magnetica (?)

  6. Apparecchiature da allestire in parte finanziate da FIRB: • Sistema d'immagine magnetica Kerr • Apparecchiatura magneto-ottica in situ sull'apparato di sputtering • Criostato per Magnetometro AGFM

  7. Materiali studiati • Film e multistrati di: Fe-Al, Co-Fe, Co-CoO, Ni-NiO • Ge(Mn) • CoPt

  8. Magneto-Optical Kerr Effect (MOKE) measurements variable wavelength,variable temperature,Hysteresis loops

  9. EXCHANGE-BIAS COUPLING IN Co/CoO BILAYERS

  10. Sample #3

  11. Exchange-Bias Field vs. Temperature Coercive Field vs. Temperature

  12. [Fex/Aly]N multilayers on Si(100) Longitudinal MOKE hysteresis on sample [Fe/Al] x 4. The film is oriented with the easy magnetization axis parallel to the H direction

  13. [Fex/Aly]4 Loop squareness vs. the angle between the [011] axis of the substrate and the magnetic field direction

  14. [Fex/Aly]N Coercive field as a function of the number of Fe/Al layer pairs

  15. [CoFe] T = 30 K - Minor Loops

  16. 0.03 (°) Mn 2.7% q 0.02 Mn 4.4% Mn 5.3% 0.01 0.00 H (kOe) -0.01 MOKE hysteresis loop at T = 100 K for the meas -0.02 samples deposited at T = G 160 °C. -0.03 -6 -4 -2 0 2 4 6 MnxGe1-x

  17. Coercive field vs. Temperature 4 Temperature dependence of the (kOe) coercive field for the C samples deposited at H T = 160 °C. Mn 2.7% G 2 Mn4.4% Mn 5.3% (Hcx10) Mn 2.7% after aging 0 0 100 200 300 T (K)

  18. Magnetization vs. Temperature 0.8 Temperature dependence of MOKE saturationnormalizedto Mn concentration for the 0.6 samples deposited at /x (°) T = 160 °C. G S Mn 2.7% 0.4 Mn4.4% Mn 5.3% Mn 2.7% after aging 0.2 0 0 100 200 300 T (K)

  19. Misure di Magnetizzazione (Alternating Field Magnetometer) HysteresisandSwitching Field Distribution CoPt T = 600°C, p = 4.7  10-7 mbar

  20. Isothermal Remanent MagnetizationandDemagnetization Remanence Curves CoPt T = 600°C, p = 4.7  10-7 mbar

  21. Magnetization Decay CoPt T = 600°C, p = 4.7  10-7 mbar

  22. Multiple Segments, Minor Loops, etc. CoPt T = 500°C, p = 3.6  10-7 mbar

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