Molecular-Beam Epitaxy (MBE) growth of chemically ordered Co-Pt and Fe-Pt alloy phases

Robin F. C. Farrow; Gerald R. Harp; D. K. Weller; R. F. Marks; Michael F. Toney; Alfonso Cebollada; Thomas A. Rabedeau

doi:10.1117/12.175781

11 May 1994 Molecular-beam epitaxy (MBE) growth of chemically ordered Co-Pt and Fe-Pt alloy phases

Robin F. C. Farrow, Gerald R. Harp, D. K. Weller, R. F. Marks, Michael F. Toney, Alfonso Cebollada, Thomas A. Rabedeau

Proceedings Volume 2140, Epitaxial Growth Processes; (1994) https://doi.org/10.1117/12.175781
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

MBE is a powerful synthesis technique for preparation of ordered intermetallic phases since the high rates of surface diffusion allow in-plane chemical ordering to occur at temperatures far below those which are necessary for ordering in bulk samples. This lifting of kinetic constraints enables the phase diagrams to be explored at low temperatures where bulk ordering processes are often too sluggish for phase equilibria to be reached. Specifically, we describe the preparation of epitaxial films (in the thickness range 100 - 1000 angstrom) of ordered intermetallic phases in the Co-Pt and Fe-Pt intermetallic systems. Such phases are of potential importance for magnetic and magneto-optical storage applications. In particular we discuss growth and chemical ordering in epitaxial Co_1-xPt_x films near x equals 0.25, 0.5, and 0.75 as well as Fe_1-xPt_x films near x equals 0.5. Depending on growth conditions these phases order spontaneously during growth with resulting changes in the Kerr spectra. Ordering results in large Kerr rotations (approximately 1 degree(s)) in the UV spectral region for the films with x near 0.5.

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Robin F. C. Farrow, Gerald R. Harp, D. K. Weller, R. F. Marks, Michael F. Toney, Alfonso Cebollada, and Thomas A. Rabedeau "Molecular-beam epitaxy (MBE) growth of chemically ordered Co-Pt and Fe-Pt alloy phases", Proc. SPIE 2140, Epitaxial Growth Processes, (11 May 1994); https://doi.org/10.1117/12.175781

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