Magnetization signals in μm-thin lamellae of highly oriented pyrolytic graphite: A field-dependent study

Filippo S. Boi; Jiachen Xia; Gao Shuai; Ayoub Taallah; Shanling Wang; Yi He; Omololu Odunmbaku; Jiqiu Wen

doi:10.1088/2053-1591/ab540d

Magnetization signals in μm-thin lamellae of highly oriented pyrolytic graphite: A field-dependent study

Filippo S. Boi^*, Jiachen Xia, Gao Shuai, Ayoub Taallah, Shanling Wang, Yi He, Omololu Odunmbaku, Jiqiu Wen

^*Corresponding author for this work

Sichuan University

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

3 Citations (Scopus)

Abstract

The recent discovery of superconductive features in HOPG has attracted much interest. However, further investigations are needed in order to clearly elucidate the magnetization properties of these materials. In this letter we investigated the structural and magnetic characteristics of μm thin lamellae extracted from inner/central regions of HOPG (grade B, θ_misfit-tilt ∼ 0.8°) by using exfoliation-methods. Unusual magnetic signals were detected in the lamellae extracted from inner-central-regions by SQUID-magnetometry. Instead ferromagnetic signals were detected on the HOPG surface layers. The field dependent characteristics of these signals were investigated. ZFC and FC measurements of superficial and inner lamellae of the HOPG sample revealed significantly different signals which may imply the existence of multiple magnetic components within the whole HOPG structure.

Original language	English
Article number	126101
Journal	Materials Research Express
Volume	6
Issue number	12
DOIs	https://doi.org/10.1088/2053-1591/ab540d
Publication status	Published - 13 Nov 2019
Externally published	Yes

Keywords

Ferromagnetism
Graphite
HOPGlamellae
Magnetization signal
Rotational misfit angle
Superconductivity

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10.1088/2053-1591/ab540d

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title = "Magnetization signals in μm-thin lamellae of highly oriented pyrolytic graphite: A field-dependent study",

abstract = "The recent discovery of superconductive features in HOPG has attracted much interest. However, further investigations are needed in order to clearly elucidate the magnetization properties of these materials. In this letter we investigated the structural and magnetic characteristics of μm thin lamellae extracted from inner/central regions of HOPG (grade B, θmisfit-tilt ∼ 0.8°) by using exfoliation-methods. Unusual magnetic signals were detected in the lamellae extracted from inner-central-regions by SQUID-magnetometry. Instead ferromagnetic signals were detected on the HOPG surface layers. The field dependent characteristics of these signals were investigated. ZFC and FC measurements of superficial and inner lamellae of the HOPG sample revealed significantly different signals which may imply the existence of multiple magnetic components within the whole HOPG structure.",

keywords = "Ferromagnetism, Graphite, HOPGlamellae, Magnetization signal, Rotational misfit angle, Superconductivity",

author = "Boi, {Filippo S.} and Jiachen Xia and Gao Shuai and Ayoub Taallah and Shanling Wang and Yi He and Omololu Odunmbaku and Jiqiu Wen",

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doi = "10.1088/2053-1591/ab540d",

language = "English",

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T1 - Magnetization signals in μm-thin lamellae of highly oriented pyrolytic graphite

T2 - A field-dependent study

AU - Boi, Filippo S.

AU - Xia, Jiachen

AU - Shuai, Gao

AU - Taallah, Ayoub

AU - Wang, Shanling

AU - He, Yi

AU - Odunmbaku, Omololu

AU - Wen, Jiqiu

PY - 2019/11/13

Y1 - 2019/11/13

N2 - The recent discovery of superconductive features in HOPG has attracted much interest. However, further investigations are needed in order to clearly elucidate the magnetization properties of these materials. In this letter we investigated the structural and magnetic characteristics of μm thin lamellae extracted from inner/central regions of HOPG (grade B, θmisfit-tilt ∼ 0.8°) by using exfoliation-methods. Unusual magnetic signals were detected in the lamellae extracted from inner-central-regions by SQUID-magnetometry. Instead ferromagnetic signals were detected on the HOPG surface layers. The field dependent characteristics of these signals were investigated. ZFC and FC measurements of superficial and inner lamellae of the HOPG sample revealed significantly different signals which may imply the existence of multiple magnetic components within the whole HOPG structure.

AB - The recent discovery of superconductive features in HOPG has attracted much interest. However, further investigations are needed in order to clearly elucidate the magnetization properties of these materials. In this letter we investigated the structural and magnetic characteristics of μm thin lamellae extracted from inner/central regions of HOPG (grade B, θmisfit-tilt ∼ 0.8°) by using exfoliation-methods. Unusual magnetic signals were detected in the lamellae extracted from inner-central-regions by SQUID-magnetometry. Instead ferromagnetic signals were detected on the HOPG surface layers. The field dependent characteristics of these signals were investigated. ZFC and FC measurements of superficial and inner lamellae of the HOPG sample revealed significantly different signals which may imply the existence of multiple magnetic components within the whole HOPG structure.

KW - Ferromagnetism

KW - Graphite

KW - HOPGlamellae

KW - Magnetization signal

KW - Rotational misfit angle

KW - Superconductivity

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U2 - 10.1088/2053-1591/ab540d

DO - 10.1088/2053-1591/ab540d

M3 - Article

AN - SCOPUS:85075362341

SN - 2053-1591

VL - 6

JO - Materials Research Express

JF - Materials Research Express

IS - 12

M1 - 126101

ER -

Magnetization signals in μm-thin lamellae of highly oriented pyrolytic graphite: A field-dependent study

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Keywords

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