Abstract
Effect of Ga content on the phase constitution, magnetic phase transition temperatures (TC), and exchange bias (EB) behaviors of Fe50Mn24+xGa26−x (x=0, 0.5, 1, 3) as-spun ribbons have been investigated. Fe50Mn24Ga26 ribbon exhibits a magnetic phase transition of B2-type structure from FM to PM state at TC1=190K. Another magnetic phase transition of face-center-cubic structure from AFM to FM takes place at TC2=240K for Fe50Mn25Ga25 sample. The values of exchange bias field (HE) at 10K after field-cooling (FC) at 30kOe from 300K are 14, 41, 1886, 1740Oe, respectively, as x is increased from 0 to 3. The phenomena are attributed to the change of exchange interactions at FM/AFM interfaces due to the change of proportion of FM and AFM phases in low temperature magnetic states. The maximum exchange bias field HE=2.4kOe at 10K after field-cooling at 40kOe is observed for Fe50Mn25Ga25.
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