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New Magnetic Phases of bcc-Co Thin Films



T Monchesky, John Unguris


We have been able to observe two new magnetic phases of ultrathin Co by growing atomically well ordered Co films on cleaved GaAs(110) substrates. For a Co thickness less than 3.4 monolayers (ML), we find a ferromagnetically dead layer associated with the formation of interfacial Co2GaAs. For thicknesses greater than 4.1 ML, we find a new magnetic phase of bcc Co with an easy axis along the direction. This phase persists up to a thickness of 7 ML, at which point an abrupt in-plane spin-reorientation transition reorients the magnetization along the [001] direction. The new bcc-Co phase provides a new magnetic structure for potential spintronics applications.
Physical Review B (Condensed Matter and Materials Physics)


bcc-Co, cobalt, GAAS(11), SEMPA, spin-reorientation


Monchesky, T. and Unguris, J. (2005), New Magnetic Phases of bcc-Co Thin Films, Physical Review B (Condensed Matter and Materials Physics) (Accessed June 5, 2023)
Created December 31, 2004, Updated October 12, 2021