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Combustion assisted preparation of high coercivity Sm–Co hard magnet with stable single-domain size

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Combustion assisted preparation of high coercivity Sm–Co hard magnet with stable single-domain size. / Tang, Hao; Wang, Zegao; Mamakhel, Mohammad Aref Hasen; Dong, Mingdong; Christensen, Mogens.

In: Journal of Alloys and Compounds, Vol. 816, 152527, 05.03.2020.

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@article{2d741f617ea540fbab4df4bd1b43063d,
title = "Combustion assisted preparation of high coercivity Sm–Co hard magnet with stable single-domain size",
abstract = "A surge of interest has in recent years focused on the preparation of size-controlled permanent magnets through chemical routes. Herein, a sol-gel combustion assisted reduction-diffusion process is used to synthesize Sm–Co particles with sizes within the stable single-domain (SSD) size range and resulting in an impressive high coercivity of 2176 kA m−1 (27.3 kOe) at 300 K and 4297 kA m−1 (54.0 kOe) at 10 K. The structure and size of Sm–Co particles can be tuned through the Co/Sm ratio in the precursor. The sample with an average particle size of 816 nm shows the best coercive force. Magnetic properties are highly dependent on the particle size. Recoil loops, Henkel plots, and δM plots proved the existing of interparticle exchange interactions, resulting high remanence/saturation (Mr/Ms) ratio. Spark Plasma Sintering (SPS) was used to directly compact the Sm–Co particles into bulk magnets. Hysteresis loops measured with the applied magnetic field parallel and perpendicular to the pressing direction revealed the SPS process to introduce strong magnetic anisotropy. Magnetic Force Microscopy (MFM) revealed the domain size to be close to pre-pressing average particle size, ensuring a respectable coercivity. The single-domain size combined with strong anisotropy results in a massive energy product of 182 kJ m−3 (22.9 MGOe).",
keywords = "Combustion, Energy product, High coercivity, Sm–Co particles",
author = "Hao Tang and Zegao Wang and Mamakhel, {Mohammad Aref Hasen} and Mingdong Dong and Mogens Christensen",
year = "2020",
month = mar,
day = "5",
doi = "10.1016/j.jallcom.2019.152527",
language = "English",
volume = "816",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Combustion assisted preparation of high coercivity Sm–Co hard magnet with stable single-domain size

AU - Tang, Hao

AU - Wang, Zegao

AU - Mamakhel, Mohammad Aref Hasen

AU - Dong, Mingdong

AU - Christensen, Mogens

PY - 2020/3/5

Y1 - 2020/3/5

N2 - A surge of interest has in recent years focused on the preparation of size-controlled permanent magnets through chemical routes. Herein, a sol-gel combustion assisted reduction-diffusion process is used to synthesize Sm–Co particles with sizes within the stable single-domain (SSD) size range and resulting in an impressive high coercivity of 2176 kA m−1 (27.3 kOe) at 300 K and 4297 kA m−1 (54.0 kOe) at 10 K. The structure and size of Sm–Co particles can be tuned through the Co/Sm ratio in the precursor. The sample with an average particle size of 816 nm shows the best coercive force. Magnetic properties are highly dependent on the particle size. Recoil loops, Henkel plots, and δM plots proved the existing of interparticle exchange interactions, resulting high remanence/saturation (Mr/Ms) ratio. Spark Plasma Sintering (SPS) was used to directly compact the Sm–Co particles into bulk magnets. Hysteresis loops measured with the applied magnetic field parallel and perpendicular to the pressing direction revealed the SPS process to introduce strong magnetic anisotropy. Magnetic Force Microscopy (MFM) revealed the domain size to be close to pre-pressing average particle size, ensuring a respectable coercivity. The single-domain size combined with strong anisotropy results in a massive energy product of 182 kJ m−3 (22.9 MGOe).

AB - A surge of interest has in recent years focused on the preparation of size-controlled permanent magnets through chemical routes. Herein, a sol-gel combustion assisted reduction-diffusion process is used to synthesize Sm–Co particles with sizes within the stable single-domain (SSD) size range and resulting in an impressive high coercivity of 2176 kA m−1 (27.3 kOe) at 300 K and 4297 kA m−1 (54.0 kOe) at 10 K. The structure and size of Sm–Co particles can be tuned through the Co/Sm ratio in the precursor. The sample with an average particle size of 816 nm shows the best coercive force. Magnetic properties are highly dependent on the particle size. Recoil loops, Henkel plots, and δM plots proved the existing of interparticle exchange interactions, resulting high remanence/saturation (Mr/Ms) ratio. Spark Plasma Sintering (SPS) was used to directly compact the Sm–Co particles into bulk magnets. Hysteresis loops measured with the applied magnetic field parallel and perpendicular to the pressing direction revealed the SPS process to introduce strong magnetic anisotropy. Magnetic Force Microscopy (MFM) revealed the domain size to be close to pre-pressing average particle size, ensuring a respectable coercivity. The single-domain size combined with strong anisotropy results in a massive energy product of 182 kJ m−3 (22.9 MGOe).

KW - Combustion

KW - Energy product

KW - High coercivity

KW - Sm–Co particles

UR - http://www.scopus.com/inward/record.url?scp=85073974089&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2019.152527

DO - 10.1016/j.jallcom.2019.152527

M3 - Journal article

AN - SCOPUS:85073974089

VL - 816

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 152527

ER -