Probing one antiferromagnetic antiphase boundary and single magnetite domain using nanogap contacts

Han Chun Wu; Mohamed Abid; Byong S. Chun; Rafael Ramos; Oleg N. Mryasov; Igor V. Shvets

doi:10.1021/nl902973p

Probing one antiferromagnetic antiphase boundary and single magnetite domain using nanogap contacts

Han Chun Wu^*, Mohamed Abid, Byong S. Chun, Rafael Ramos, Oleg N. Mryasov, Igor V. Shvets

^*Corresponding author for this work

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

50 Citations (Scopus)

Abstract

We have probed one antiferromagnetic (AF) antiphase boundary (APB) and a single Fe₃O₄ domain using nanogap contacts. Our experiments directly demonstrate that, in the case of probing one AF-APB, a large magnetoresistance (MR), high resistivity, and a high saturation field are observed as compared with the case of probing a single Fe₃O ₄ domain. The shape of the temperature-dependent MR curves is also found to differ between the single domain and one of the AF-APB measurements, with a characteristic strong temperature dependence for the single domain and temperature independence for the one AF-APB case. We argue that these observations are indicative of profound changes in the electronic transport across APBs. The investigated APB defects increase the activation energy and disturb the long-range charge ordering of monodomain Fe₃O ₄.

Original language	English
Pages (from-to)	1132-1136
Number of pages	5
Journal	Nano Letters
Volume	10
Issue number	4
DOIs	https://doi.org/10.1021/nl902973p
Publication status	Published - 14 Apr 2010
Externally published	Yes

Keywords

Antiphase Boundary
Half-metal
Magnetite
Monodomain

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10.1021/nl902973p

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title = "Probing one antiferromagnetic antiphase boundary and single magnetite domain using nanogap contacts",

abstract = "We have probed one antiferromagnetic (AF) antiphase boundary (APB) and a single Fe3O4 domain using nanogap contacts. Our experiments directly demonstrate that, in the case of probing one AF-APB, a large magnetoresistance (MR), high resistivity, and a high saturation field are observed as compared with the case of probing a single Fe3O 4 domain. The shape of the temperature-dependent MR curves is also found to differ between the single domain and one of the AF-APB measurements, with a characteristic strong temperature dependence for the single domain and temperature independence for the one AF-APB case. We argue that these observations are indicative of profound changes in the electronic transport across APBs. The investigated APB defects increase the activation energy and disturb the long-range charge ordering of monodomain Fe3O 4.",

keywords = "Antiphase Boundary, Half-metal, Magnetite, Monodomain",

author = "Wu, {Han Chun} and Mohamed Abid and Chun, {Byong S.} and Rafael Ramos and Mryasov, {Oleg N.} and Shvets, {Igor V.}",

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T1 - Probing one antiferromagnetic antiphase boundary and single magnetite domain using nanogap contacts

AU - Wu, Han Chun

AU - Abid, Mohamed

AU - Chun, Byong S.

AU - Ramos, Rafael

AU - Mryasov, Oleg N.

AU - Shvets, Igor V.

PY - 2010/4/14

Y1 - 2010/4/14

N2 - We have probed one antiferromagnetic (AF) antiphase boundary (APB) and a single Fe3O4 domain using nanogap contacts. Our experiments directly demonstrate that, in the case of probing one AF-APB, a large magnetoresistance (MR), high resistivity, and a high saturation field are observed as compared with the case of probing a single Fe3O 4 domain. The shape of the temperature-dependent MR curves is also found to differ between the single domain and one of the AF-APB measurements, with a characteristic strong temperature dependence for the single domain and temperature independence for the one AF-APB case. We argue that these observations are indicative of profound changes in the electronic transport across APBs. The investigated APB defects increase the activation energy and disturb the long-range charge ordering of monodomain Fe3O 4.

AB - We have probed one antiferromagnetic (AF) antiphase boundary (APB) and a single Fe3O4 domain using nanogap contacts. Our experiments directly demonstrate that, in the case of probing one AF-APB, a large magnetoresistance (MR), high resistivity, and a high saturation field are observed as compared with the case of probing a single Fe3O 4 domain. The shape of the temperature-dependent MR curves is also found to differ between the single domain and one of the AF-APB measurements, with a characteristic strong temperature dependence for the single domain and temperature independence for the one AF-APB case. We argue that these observations are indicative of profound changes in the electronic transport across APBs. The investigated APB defects increase the activation energy and disturb the long-range charge ordering of monodomain Fe3O 4.

KW - Antiphase Boundary

KW - Half-metal

KW - Magnetite

KW - Monodomain

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EP - 1136

JO - Nano Letters

JF - Nano Letters

IS - 4

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Probing one antiferromagnetic antiphase boundary and single magnetite domain using nanogap contacts

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Keywords

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