Magnetostructure of MnAs on GaAs revisited
Ernst Bauer, Rachid Belkhou, Salia Cherifi (NEEL), Andrea Locatelli,, A. Pavlovska, Nicolas Rougemaille (NEEL)
TL;DR
This study investigates the magnetic phase transition in MnAs layers on GaAs using advanced x-ray techniques, revealing antiferromagnetic characteristics in the nonferromagnetic phase and addressing longstanding controversies.
Contribution
It provides new insights into the magnetic structure of the β-MnAs phase, demonstrating antiferromagnetic order using XMLD signals, which clarifies previous ambiguities.
Findings
β-MnAs exhibits antiferromagnetic order in the coexistence region.
X-ray magnetic dichroism techniques effectively identify magnetic states.
The study discusses potential causes for the elusive magnetic nature of β-MnAs.
Abstract
The ferromagnetic to nonferromagnetic (α-β) phase transition in epitaxial MnAs layers on GaAs(100) is studied by x-ray magnetic circular dichroism and x-ray magnetic linear dichroism photoemission electron microscopy in order to elucidate the nature of the controversial nonferromagnetic state of β-MnAs. In the coexistence region of the two phases the β phase shows a clear XMLD signal characteristic of antiferromagnetism. The nature and the possible causes of the elusiveness of this magnetic state are discussed.
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