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Probing the magnetic properties of ultrathin Pt/Mn bilayers

Title
Probing the magnetic properties of ultrathin Pt/Mn bilayers
Authors
Pham T.K.H.Ribeiro M.Kim T.H.
Ewha Authors
김태희
SCOPUS Author ID
김태희scopus
Issue Date
2019
Journal Title
Thin Solid Films
ISSN
0040-6090JCR Link
Citation
Thin Solid Films vol. 671, pp. 1 - 5
Keywords
AntiferromagnetismMagnetotransport propertiesManganese filmsMorphology effectSurface magnetism
Publisher
Elsevier B.V.
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
We report on the interplay between surface morphology and the magnetic properties of Pt/Mn ultra-thin bilayers by measuring the temperature dependence of the resistivity of Hall bars cooled under application of an external magnetic field. The resistivity (ρ) versus temperature (T) curves measured under a magnetic field applied along the x-, y- and z- directions exhibit a clear difference between the zero-field-cooled (ZFC) and field-cooled (FC) traces. The disparity between the ZFC and FC traces allowed us to determine the direction of the magnetic easy-axis. The ρ vs. T characteristic of the Pt/Mn bilayers revealed the existence of antiferromagnetic (AF) order below 79 K, in agreement with the Néel temperature observed in temperature dependent susceptibility curves. We also investigated the morphological evolution of the Mn films as a function of Mn thickness by atomic force microscopy (AFM). We observed the formation of a Mn layered structure on a 2nm-thick Al 2 O 3 buffer layer for films thicker than 2.5 nm. Our results suggest that bilayer structures consisting of non-magnetic noble metals on ultra-thin antiferromagnetic metals can be used as a probe to explore the complex magnetic properties of the AF layer. © 2018 The Authors
DOI
10.1016/j.tsf.2018.12.011
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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