4/4 INFM-LAQUILA FILM E MULTISTRATI MAGNETICI Franco Lucari INFM-LAQUILA FILM E MULTISTRATI...

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Transcript of 4/4 INFM-LAQUILA FILM E MULTISTRATI MAGNETICI Franco Lucari INFM-LAQUILA FILM E MULTISTRATI...

  • Slide 1
  • 4/4 INFM-LAQUILA FILM E MULTISTRATI MAGNETICI Franco Lucari INFM-LAQUILA FILM E MULTISTRATI MAGNETICI Franco Lucari
  • Slide 2
  • Film e multistrati magnetici UNIVERSIT DELLAQUILA
  • Slide 3
  • Universit dellAquila - FIRB Il gruppo composto da: Lucari Franco DOrazio 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
  • Slide 4
  • Le apparecchiature in dotazione Apparato di misura magneto-ottico per misure Faraday, Kerr polare o longitudinale, MCD, MLD: campo magnetico B5600 gauss, temperatura 4 T300 K, lunghezza d'onda 0.4l2.6 mm. Suscettometro Lakeshore 7030: frequenza 5n10000 Hz, temperatura 15 T300 K, campo magnetico di misura 0.1H25 Oe. Apparato di deposizione per sputtering (magnetron, 3 catodi) Magnetometro AGFM Princeton Instr., Campo B < 1.4 T Calcolatori
  • Slide 5
  • Apparecchiature a cui possibile accedere localmente Diffrazione a raggi X SEM (TEM?) XPS Microscopia a forza atomica Microscopia a forza magnetica (?)
  • Slide 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
  • Slide 7
  • Materiali studiati Film e multistrati di: Fe-Al, Co-Fe, Co-CoO, Ni-NiO Ge(Mn) CoPt
  • Slide 8
  • Magneto-Optical Kerr Effect (MOKE) measurements variable wavelength, variable temperature, Hysteresis loops
  • Slide 9
  • EXCHANGE-BIAS COUPLING IN Co/CoO BILAYERS
  • Slide 10
  • Sample #3
  • Slide 11
  • Exchange-Bias Field vs. Temperature Coercive Field vs. Temperature
  • Slide 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
  • Slide 13
  • Loop squareness vs. the angle between the [011] axis of the substrate and the magnetic field direction [Fex/Aly]4
  • Slide 14
  • Coercive field as a function of the number of Fe/Al layer pairs [Fex/Aly]N
  • Slide 15
  • [CoFe] T = 30 K - Minor Loops
  • Slide 16
  • Mn x Ge 1-x
  • Slide 17
  • 0 2 4 0100200300 T (K) H C (kOe) Mn 2.7% Mn4.4% Mn 5.3% (Hcx10) Mn 2.7% after aging Coercive field vs. Temperature Temperature dependence of the coercive field for the samples deposited at T G = 160 C.
  • Slide 18
  • 0 0.2 0.4 0.6 0.8 0100200300 T (K) S /x () Temperature dependence of MOKE saturation normalized to Mn concentration for the samples deposited at T G = 160 C. Magnetization vs. Temperature Mn 2.7% Mn4.4% Mn 5.3% Mn 2.7% after aging
  • Slide 19
  • Misure di Magnetizzazione (Alternating Field Magnetometer) Hysteresis and Switching Field Distribution CoPt T = 600C, p = 4.7 10 -7 mbar
  • Slide 20
  • Isothermal Remanent Magnetization and Demagnetization Remanence Curves CoPt T = 600C, p = 4.7 10 -7 mbar
  • Slide 21
  • Magnetization Decay CoPt T = 600C, p = 4.7 10 -7 mbar
  • Slide 22
  • Multiple Segments, Minor Loops, etc. CoPt T = 500C, p = 3.6 10 -7 mbar