Abstract
The magnetic behavior of Ni 2+ x Mn 1− x Al alloys around the stoichiometric 2:1:1 composition was investigated with several experimental techniques. The results of low-temperature magnetization measurements indicate that a competition mechanism between ferromagnetism and antiferromagnetism is expected in off-stoichiometric alloys. Although the Curie temperature is strongly dependent on the composition, the saturation magnetization has an unsystematic variation for deviations from the stoichiometric Ni 2MnAl alloy. A reentrant-spin–glass behavior is observed below 50 K.
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