Magnetic multi-granule nanoclusters: A model system that exhibits universal size effect of magnetic coercivity

Ji Sung Lee; Jin Myung Cha; Ha Young Yoon; Jin Kyu Lee; Young Keun Kim

doi:10.1038/srep12135

Magnetic multi-granule nanoclusters: A model system that exhibits universal size effect of magnetic coercivity

Ji Sung Lee, Jin Myung Cha, Ha Young Yoon, Jin Kyu Lee, Young Keun Kim

Department of Materials Science and Engineering

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

138 Citations (Scopus)

Abstract

It is well known that the coercivity of magnetic nanomaterials increases up to a maximum and then decreases to zero with decreasing particle size. However, until now, no single synthesis method has been able to produce magnetic nanoparticles with a wide range of sizes, i.e., from 10 to 500 nm, in order to uncover the coercivity evolution. Here we report the characterization of magnetite (Fe₃O₄) multi-granule nanoclusters (MGNCs) to demonstrate the transitional behaviour of coercivity. The M-H curves indicate that our samples had a relatively high saturation magnetization (M_S) value of ∼70 emu/g and that the coercivity (H_c) increased to the maximum value of ∼48 Oe until the nanoclusters reached a size of ∼120 nm; the coercivity then gradually decreased to zero.

Original language	English
Article number	12135
Journal	Scientific reports
Volume	5
DOIs	https://doi.org/10.1038/srep12135
Publication status	Published - 2015 Jul 17

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title = "Magnetic multi-granule nanoclusters: A model system that exhibits universal size effect of magnetic coercivity",

abstract = "It is well known that the coercivity of magnetic nanomaterials increases up to a maximum and then decreases to zero with decreasing particle size. However, until now, no single synthesis method has been able to produce magnetic nanoparticles with a wide range of sizes, i.e., from 10 to 500 nm, in order to uncover the coercivity evolution. Here we report the characterization of magnetite (Fe3O4) multi-granule nanoclusters (MGNCs) to demonstrate the transitional behaviour of coercivity. The M-H curves indicate that our samples had a relatively high saturation magnetization (MS) value of ∼70 emu/g and that the coercivity (Hc) increased to the maximum value of ∼48 Oe until the nanoclusters reached a size of ∼120 nm; the coercivity then gradually decreased to zero.",

author = "Lee, {Ji Sung} and Cha, {Jin Myung} and Yoon, {Ha Young} and Lee, {Jin Kyu} and Kim, {Young Keun}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (2014M3A7B4052193, 2013K2A1A7076318, 2012-0009552) funded by the Ministry of Science, ICT & Future Planning.",

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doi = "10.1038/srep12135",

language = "English",

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T1 - Magnetic multi-granule nanoclusters

T2 - A model system that exhibits universal size effect of magnetic coercivity

AU - Lee, Ji Sung

AU - Cha, Jin Myung

AU - Yoon, Ha Young

AU - Lee, Jin Kyu

AU - Kim, Young Keun

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (2014M3A7B4052193, 2013K2A1A7076318, 2012-0009552) funded by the Ministry of Science, ICT & Future Planning.

PY - 2015/7/17

Y1 - 2015/7/17

N2 - It is well known that the coercivity of magnetic nanomaterials increases up to a maximum and then decreases to zero with decreasing particle size. However, until now, no single synthesis method has been able to produce magnetic nanoparticles with a wide range of sizes, i.e., from 10 to 500 nm, in order to uncover the coercivity evolution. Here we report the characterization of magnetite (Fe3O4) multi-granule nanoclusters (MGNCs) to demonstrate the transitional behaviour of coercivity. The M-H curves indicate that our samples had a relatively high saturation magnetization (MS) value of ∼70 emu/g and that the coercivity (Hc) increased to the maximum value of ∼48 Oe until the nanoclusters reached a size of ∼120 nm; the coercivity then gradually decreased to zero.

AB - It is well known that the coercivity of magnetic nanomaterials increases up to a maximum and then decreases to zero with decreasing particle size. However, until now, no single synthesis method has been able to produce magnetic nanoparticles with a wide range of sizes, i.e., from 10 to 500 nm, in order to uncover the coercivity evolution. Here we report the characterization of magnetite (Fe3O4) multi-granule nanoclusters (MGNCs) to demonstrate the transitional behaviour of coercivity. The M-H curves indicate that our samples had a relatively high saturation magnetization (MS) value of ∼70 emu/g and that the coercivity (Hc) increased to the maximum value of ∼48 Oe until the nanoclusters reached a size of ∼120 nm; the coercivity then gradually decreased to zero.

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Magnetic multi-granule nanoclusters: A model system that exhibits universal size effect of magnetic coercivity

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