Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
The magnetic phase diagrams of Cr with group-8 magnetic transition metals Co and Fe exhibits a triple point, where the incommensurate (I) spin density wave (SDW), commensurate (C) SDW and paramagnetic (P) phases converge . Cr-Co alloys has shown considerable promise in practical applications because of its Invar-like properties , as well as the fact that Cr/Co multi-layered systems show enhancement of the SDW due to the exchange interaction between the Co moments and the SDW these alloys . This can find application in recording and storage media. Comparison between Cr in bulk and thin film forms revealed dimensionality plays an important role in modifying the SDW structure  and this study extends these investigations to include Cr-Co. Epitaxial Cr100-xCox thin films of thickness (t) 200nm, with 0 < x < 8, were prepared on MgO(100) substrates using DC magnetron co-sputtering techniques. The epitaxial nature of these monolayers was confirmed using XRD analyses. The resistivity (ρ) for these samples was determined in the temperature range 2K < T < 395K and the temperature associated with the minimum in the dρ/dT versus T curves were used to determine the Néel transition temperatures (TN) for the individual samples. The TN versus x plot for this sample series shows that TN decreases up to 2at.% Co and then increases, reaching a maximum at approximately 6at.% Co. Hall coefficients (RH ) for the films with x = 1 and 4 were determined on cooling from 300K down to 2K, in a constant magnetic field of 5 T. Interestingly, the RH versus T plots appears to reveal a spin-flip transition at about 100K for 1at.% Co thin film, while it is absent for 4at.% Co sample. The present results will shed light on the effect of dimensionality on the electrical properties of the Cr-Co alloys.
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 Zabel H 1999 J.Phys. Condens. Matter 11 9303
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