Sm(Co,Cu)5-type phases are of fundamental interest as they play a pivotal role in the complex coercivity mechanism of 2:17-type precipitation hardened magnets [1] and have been reported to show unusual phenomena such as giant intrinsic magnetic hardness [2] and a field-induced transition in the magnetization [3]. Such a jump in magnetization occurs also in SmCo{sub}3Cu{sub}2 and SmCo{sub}2.5Cu{sub}2.5 [4]. A further investigation of the high field magnetization in SmCo{sub}(5-x)Cu{sub}x was performed by us [5]. Up to now no conclusive explanation for the field induced transition was given. In this work we present results from microstructure investigation and magnetization measurements up to 50T to elucidate the occurrence of the high field transition.
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