Combined Co K-edge XANES-XMCD and XRD measurements were used to shed light on the magnetic and structural phase diagram of the Fe1-xCox alloy under HP in the Co-rich region (x epsilon 0.5). At 0.5x0.75, the alloy shows a pressure-induced structural/magnetic phase transition from bcc-FM to hcp-non-FM phase just like pure iron but at higher pressures. The x=0.9 sample has an fcc structure in the pressure range investigated but presents an FM to non-FM transition at P=64GPa, a significantly lower pressure compared with pure Co (predicted approximate to 120GPa), showing that Fe impurities strongly affect the HP Co response.
Structure and magnetism in compressed iron-cobalt alloys
CENTOMO, PAOLO;
2011
Abstract
Combined Co K-edge XANES-XMCD and XRD measurements were used to shed light on the magnetic and structural phase diagram of the Fe1-xCox alloy under HP in the Co-rich region (x epsilon 0.5). At 0.5x0.75, the alloy shows a pressure-induced structural/magnetic phase transition from bcc-FM to hcp-non-FM phase just like pure iron but at higher pressures. The x=0.9 sample has an fcc structure in the pressure range investigated but presents an FM to non-FM transition at P=64GPa, a significantly lower pressure compared with pure Co (predicted approximate to 120GPa), showing that Fe impurities strongly affect the HP Co response.
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