Probing the magnetic properties of ultrathin Pt/Mn bilayers

Thi Kim Hang Pham; Mário Ribeiro; Tae Hee Kim

doi:10.1016/j.tsf.2018.12.011

Probing the magnetic properties of ultrathin Pt/Mn bilayers

Thi Kim Hang Pham, Mário Ribeiro, Tae Hee Kim

Department of Physics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

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 Al₂O₃ 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.

Original language	English
Pages (from-to)	1-5
Number of pages	5
Journal	Thin Solid Films
Volume	671
DOIs	https://doi.org/10.1016/j.tsf.2018.12.011
State	Published - 1 Feb 2019

Keywords

Antiferromagnetism
Magnetotransport properties
Manganese films
Morphology effect
Surface magnetism

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10.1016/j.tsf.2018.12.011

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title = "Probing the magnetic properties of ultrathin Pt/Mn bilayers",

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 N{\'e}el 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 Al2O3 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.",

keywords = "Antiferromagnetism, Magnetotransport properties, Manganese films, Morphology effect, Surface magnetism",

author = "Pham, {Thi Kim Hang} and M{\'a}rio Ribeiro and Kim, {Tae Hee}",

note = "Funding Information: This work was supported by the Institute for Basic Science , Republic of Korea ( IBS-R027-D1 ). Part of this study has been performed using the facilities at IBS Center for Correlated Electron Systems, Seoul National University . Funding Information: This work was supported by the Institute for Basic Science, Republic of Korea (IBS-R027-D1). Part of this study has been performed using the facilities at IBS Center for Correlated Electron Systems, Seoul National University. Publisher Copyright: {\textcopyright} 2018 The Authors",

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AU - Pham, Thi Kim Hang

AU - Ribeiro, Mário

AU - Kim, Tae Hee

N1 - Funding Information: This work was supported by the Institute for Basic Science , Republic of Korea ( IBS-R027-D1 ). Part of this study has been performed using the facilities at IBS Center for Correlated Electron Systems, Seoul National University . Funding Information: This work was supported by the Institute for Basic Science, Republic of Korea (IBS-R027-D1). Part of this study has been performed using the facilities at IBS Center for Correlated Electron Systems, Seoul National University. Publisher Copyright: © 2018 The Authors

PY - 2019/2/1

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N2 - 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 Al2O3 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.

AB - 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 Al2O3 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.

KW - Antiferromagnetism

KW - Magnetotransport properties

KW - Manganese films

KW - Morphology effect

KW - Surface magnetism

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JO - Thin Solid Films

JF - Thin Solid Films

ER -

Probing the magnetic properties of ultrathin Pt/Mn bilayers

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Keywords

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