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Coexisting ferro- and antiferromagnetism in Ni2MnAl Heusler alloys

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The structural and magnetic properties of stoichiometric Ni2MnAl are studied to clarify the conditions for ferromagnetic and antiferromagnetic ordering claimed to occur in this compound. X-ray and magnetization measurements show that although a single phase B2 structure can be stabilized at room temperature, a single L21 phase is not readily stabilized, but rather a mixed L21+B2 state occurs. The mixed state incorporates ferromagnetic and antiferromagnetic parts for which close-lying Curie and a Néel temperatures can be identified from magnetization measurements.

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Coexisting ferro- and antiferromagnetism in Ni2MnAl Heusler alloys