On the magnetic ordering in amorphous and quasi-crystalline Al-Mn phases

In this letter, we report on the achievement of exchange anisotropy magnitude in a nanostructured Mn55Al45 alloy fabricated by rapid solidification with large exchange bias values (HE ≈ 13 kOe at 10 K) and a blocking temperature of TB ∼ 95 K. Field-cooled magnetization loops show a prominent exchange bias for T < TB signaling the simultaneous presence of antiferromagnetic and ferromagnetic phases at these temperatures. Structural probes confirm a majority presence of the high-temperature metastable hexagonal ɛ-MnAl in the as-solidified state with an intriguing double-Bragg peak structure indicative of phase separation. The observed exchange bias is hypothesized to originate from an intimate mixture of antiferromagnetic and nanoscaled ferromagnetic phases or dual mictomagnetic phases, approximating a cluster glass with well-defined variations in the local Mn concentration of the composition and leading to Mn-rich and Mn-poor regions with antiferromagnetic and ferromagnetic characters, respectively.

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Exchange anisotropy in the nanostructured MnAl system

Jiménez-Villacorta

Marion

Sepehrifar

et al. 2012

Applied Physics Letters

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On the magnetic ordering in amorphous and quasi-crystalline Al-Mn phases

Cited by 1 publication

References 7 publications

Exchange anisotropy in the nanostructured MnAl system

Exchange anisotropy in the nanostructured MnAl system

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