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AM: Magnetismus

AM 13: Postersitzung: Dünne Schichten (1–22), Magnetowiderstand (23–40), Phasenübergänge (41–55), Mikromagnetismus (56–68), Spektroskopie (69–77), Nanokristalline Materialien (78–82), Anisotropie (83–86), Schmelzen (87–90), Weitere Bereiche (91–100)

AM 13.18: Poster

Dienstag, 28. März 2000, 16:00–20:00, A

Structural and magnetic properties of Fe thin films on Cu₉₀Au₁₀(001) — •S. S. Kang, W. Kuch, and J. Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle

A series of Fe thin films with thicknesses ranging from 2 monolayers (ML) to 30 ML was deposited on a Cu₉₀Au₁₀ (001) substrate (a₀ = 3.66 Å) at room temperature. The structural properties were investigated by low energy electron diffraction (LEED). From the intensity/voltage (I/V) measurements of the (0,0) LEED spot, three different peak sequences, which correspond to three different structural phases, were observed. The first peak sequence, which appears at low coverages of Fe (≤ 3 ML), is related to a tetragonally expanded fcc phase with an interlayer distance a_0⊥ around 1.90 Å. With increasing Fe thickness, the second peak sequence becomes predominant, which is associated with an interlayer distance a_0⊥≈ 1.74 Å. With further increasing Fe thickness (≥ 12 ML), the third peak sequence occurs and indicates a bcc (110) structure with a_0⊥≈ 2.02 Å. The magnetic properties were studied by in situ magneto-optical Kerr effect (MOKE). It was found that the Fe films of the first and third phase have a high-spin ferromagnetic moment, while they exhibit a low magnetic moment in the second phase. Moreover, the MOKE loops reveal that the magnetization of all films is in-plane. No perpendicular component could be found at the thicknesses investigated here.