Electric polarization enhancement in multiferroic CoCr2 O4 crystals with Cr-site mixing

Ingyu Kim; Yoon Seok Oh; Yong Liu; Sae Hwan Chun; Jun Sik Lee; Kyung Tae Ko; Jae Hoon Park; Jae Ho Chung; Kee Hoon Kim

doi:10.1063/1.3076102

Electric polarization enhancement in multiferroic CoCr2 O4 crystals with Cr-site mixing

Ingyu Kim, Yoon Seok Oh, Yong Liu, Sae Hwan Chun, Jun Sik Lee, Kyung Tae Ko, Jae Hoon Park, Jae Ho Chung, Kee Hoon Kim

Department of Physics

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

43 Citations (Scopus)

Abstract

Single crystals of multiferroic cobalt chromite Co (Cr_2-x Cox) O4 have been grown via several methods to have different Co³+ doping levels (x=0.0, 0.14, and 0.18). Under magnetic fields, all the crystals display electric polarization reversal below their spiral spin ordering temperatures. We find that both saturated electric polarization and magnetization under magnetic fields increase significantly with the increase in x. This result can be qualitatively explained by a broken balance between at least two electric polarization contributions existing in CoCr₂ O₄ and is expected to be useful in tailoring electric polarization in similar kinds of multiferroics.

Original language	English
Article number	042505
Journal	Applied Physics Letters
Volume	94
Issue number	4
DOIs	https://doi.org/10.1063/1.3076102
Publication status	Published - 2009

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3076102

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@article{dd6fd742f92c457c981153353a68f9ec,

title = "Electric polarization enhancement in multiferroic CoCr2 O4 crystals with Cr-site mixing",

abstract = "Single crystals of multiferroic cobalt chromite Co (Cr2-x Cox) O4 have been grown via several methods to have different Co3+ doping levels (x=0.0, 0.14, and 0.18). Under magnetic fields, all the crystals display electric polarization reversal below their spiral spin ordering temperatures. We find that both saturated electric polarization and magnetization under magnetic fields increase significantly with the increase in x. This result can be qualitatively explained by a broken balance between at least two electric polarization contributions existing in CoCr2 O4 and is expected to be useful in tailoring electric polarization in similar kinds of multiferroics.",

author = "Ingyu Kim and Oh, {Yoon Seok} and Yong Liu and Chun, {Sae Hwan} and Lee, {Jun Sik} and Ko, {Kyung Tae} and Park, {Jae Hoon} and Chung, {Jae Ho} and Kim, {Kee Hoon}",

note = "Funding Information: We thank Greg Stewart for critical reading of our manuscript. This study was supported by the NRL program (Program No. M10600000238) and the KRF Grant (Grant No. KRF-2008-314-C00101) by MEST and the Fundamental R&D Program for Core Technology of Materials by MOKE. Ingyu Kim was supported by Seoul R&BD. The research carried out at POSTECH was supported by KOSEF (Grant No. R01-2007-000-11188-0) and POSTECH research fund. PLS was supported by MEST and POSTECH. JHC was supported by KOSEF (Grant No. R01-2008-000-10787-0).",

year = "2009",

doi = "10.1063/1.3076102",

language = "English",

volume = "94",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "4",

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TY - JOUR

T1 - Electric polarization enhancement in multiferroic CoCr2 O4 crystals with Cr-site mixing

AU - Kim, Ingyu

AU - Oh, Yoon Seok

AU - Liu, Yong

AU - Chun, Sae Hwan

AU - Lee, Jun Sik

AU - Ko, Kyung Tae

AU - Park, Jae Hoon

AU - Chung, Jae Ho

AU - Kim, Kee Hoon

N1 - Funding Information: We thank Greg Stewart for critical reading of our manuscript. This study was supported by the NRL program (Program No. M10600000238) and the KRF Grant (Grant No. KRF-2008-314-C00101) by MEST and the Fundamental R&D Program for Core Technology of Materials by MOKE. Ingyu Kim was supported by Seoul R&BD. The research carried out at POSTECH was supported by KOSEF (Grant No. R01-2007-000-11188-0) and POSTECH research fund. PLS was supported by MEST and POSTECH. JHC was supported by KOSEF (Grant No. R01-2008-000-10787-0).

PY - 2009

Y1 - 2009

N2 - Single crystals of multiferroic cobalt chromite Co (Cr2-x Cox) O4 have been grown via several methods to have different Co3+ doping levels (x=0.0, 0.14, and 0.18). Under magnetic fields, all the crystals display electric polarization reversal below their spiral spin ordering temperatures. We find that both saturated electric polarization and magnetization under magnetic fields increase significantly with the increase in x. This result can be qualitatively explained by a broken balance between at least two electric polarization contributions existing in CoCr2 O4 and is expected to be useful in tailoring electric polarization in similar kinds of multiferroics.

AB - Single crystals of multiferroic cobalt chromite Co (Cr2-x Cox) O4 have been grown via several methods to have different Co3+ doping levels (x=0.0, 0.14, and 0.18). Under magnetic fields, all the crystals display electric polarization reversal below their spiral spin ordering temperatures. We find that both saturated electric polarization and magnetization under magnetic fields increase significantly with the increase in x. This result can be qualitatively explained by a broken balance between at least two electric polarization contributions existing in CoCr2 O4 and is expected to be useful in tailoring electric polarization in similar kinds of multiferroics.

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U2 - 10.1063/1.3076102

DO - 10.1063/1.3076102

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AN - SCOPUS:59349096908

SN - 0003-6951

VL - 94

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 4

M1 - 042505

ER -

Electric polarization enhancement in multiferroic CoCr2 O4 crystals with Cr-site mixing

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