Processing and hard magnetic properties of nanocrystalline Sm(Co, Zr)7 magnet powders

H. Tang, J. Zhou, Y. Liu, D. J. Sellmyer

Research output: Contribution to journalConference article

Abstract

Isotropic nanocrystalline Sm(Co, Zr)7 permanent magnet powders of the TbCu7 type structure and with high coercivity and enhanced remanent magnetization has been synthesized by mechanically milling Sm12.5Co87.5-xZrx alloys (x = 0, 1, 2, 3) alloys and subsequently appropriate annealing. The mechanical-milling process of the alloys and the formation of nanostructured Sm(Co, Zr)7 magnet powders have been investigated with respect to hard magnetic properties. Hard magnetic properties are found to be strongly dependent upon the processing condition (like milling time, annealing temperature, etc.). Optimal coercivity Hci of value above 21 kOe has been obtained in Sm12.5Co85.5Zr2 magnet powders subjected to milling for 5 hr and annealing at 600°C for 20min. Optimal remanent magnetization Mr of 73.4 emu/g, remanence ratio Mr/Ms of 0.71, and maximum energy products (BH)max of over 13 MGOe have been realized in Sm12.5Co87.5-xZrx (x = 1, 2) magnet powders with grain size of 15-20 nm. The hard magnetic properties are ascribed to the nanosized Sm(Co, Zr)7 phase of the TbCu7 type structure with grain size of 10-20 nm. The enhancement of remanent magnetization may be contributed from the enhanced exchange-coupling interaction between nanosized grains.

Original languageEnglish (US)
Pages (from-to)L8.4.1-L8.4.6
JournalMaterials Research Society Symposium - Proceedings
Volume644
StatePublished - Dec 1 2001
EventSupercooled Liquid, Bulk Glassy and Nanocrystalline states of Alloys - Boston, MA, United States
Duration: Nov 27 2000Nov 30 2000

Fingerprint

Powders
Magnets
Magnetic properties
magnets
magnetic properties
Magnetization
Annealing
Processing
Coercive force
magnetization
annealing
coercivity
grain size
Exchange coupling
Remanence
remanence
permanent magnets
Permanent magnets
augmentation
products

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Processing and hard magnetic properties of nanocrystalline Sm(Co, Zr)7 magnet powders. / Tang, H.; Zhou, J.; Liu, Y.; Sellmyer, D. J.

In: Materials Research Society Symposium - Proceedings, Vol. 644, 01.12.2001, p. L8.4.1-L8.4.6.

Research output: Contribution to journalConference article

@article{112b9e97ca56499abdc54c65b4f949a7,
title = "Processing and hard magnetic properties of nanocrystalline Sm(Co, Zr)7 magnet powders",
abstract = "Isotropic nanocrystalline Sm(Co, Zr)7 permanent magnet powders of the TbCu7 type structure and with high coercivity and enhanced remanent magnetization has been synthesized by mechanically milling Sm12.5Co87.5-xZrx alloys (x = 0, 1, 2, 3) alloys and subsequently appropriate annealing. The mechanical-milling process of the alloys and the formation of nanostructured Sm(Co, Zr)7 magnet powders have been investigated with respect to hard magnetic properties. Hard magnetic properties are found to be strongly dependent upon the processing condition (like milling time, annealing temperature, etc.). Optimal coercivity Hci of value above 21 kOe has been obtained in Sm12.5Co85.5Zr2 magnet powders subjected to milling for 5 hr and annealing at 600°C for 20min. Optimal remanent magnetization Mr of 73.4 emu/g, remanence ratio Mr/Ms of 0.71, and maximum energy products (BH)max of over 13 MGOe have been realized in Sm12.5Co87.5-xZrx (x = 1, 2) magnet powders with grain size of 15-20 nm. The hard magnetic properties are ascribed to the nanosized Sm(Co, Zr)7 phase of the TbCu7 type structure with grain size of 10-20 nm. The enhancement of remanent magnetization may be contributed from the enhanced exchange-coupling interaction between nanosized grains.",
author = "H. Tang and J. Zhou and Y. Liu and Sellmyer, {D. J.}",
year = "2001",
month = "12",
day = "1",
language = "English (US)",
volume = "644",
pages = "L8.4.1--L8.4.6",
journal = "Materials Research Society Symposium - Proceedings",
issn = "0272-9172",
publisher = "Materials Research Society",

}

TY - JOUR

T1 - Processing and hard magnetic properties of nanocrystalline Sm(Co, Zr)7 magnet powders

AU - Tang, H.

AU - Zhou, J.

AU - Liu, Y.

AU - Sellmyer, D. J.

PY - 2001/12/1

Y1 - 2001/12/1

N2 - Isotropic nanocrystalline Sm(Co, Zr)7 permanent magnet powders of the TbCu7 type structure and with high coercivity and enhanced remanent magnetization has been synthesized by mechanically milling Sm12.5Co87.5-xZrx alloys (x = 0, 1, 2, 3) alloys and subsequently appropriate annealing. The mechanical-milling process of the alloys and the formation of nanostructured Sm(Co, Zr)7 magnet powders have been investigated with respect to hard magnetic properties. Hard magnetic properties are found to be strongly dependent upon the processing condition (like milling time, annealing temperature, etc.). Optimal coercivity Hci of value above 21 kOe has been obtained in Sm12.5Co85.5Zr2 magnet powders subjected to milling for 5 hr and annealing at 600°C for 20min. Optimal remanent magnetization Mr of 73.4 emu/g, remanence ratio Mr/Ms of 0.71, and maximum energy products (BH)max of over 13 MGOe have been realized in Sm12.5Co87.5-xZrx (x = 1, 2) magnet powders with grain size of 15-20 nm. The hard magnetic properties are ascribed to the nanosized Sm(Co, Zr)7 phase of the TbCu7 type structure with grain size of 10-20 nm. The enhancement of remanent magnetization may be contributed from the enhanced exchange-coupling interaction between nanosized grains.

AB - Isotropic nanocrystalline Sm(Co, Zr)7 permanent magnet powders of the TbCu7 type structure and with high coercivity and enhanced remanent magnetization has been synthesized by mechanically milling Sm12.5Co87.5-xZrx alloys (x = 0, 1, 2, 3) alloys and subsequently appropriate annealing. The mechanical-milling process of the alloys and the formation of nanostructured Sm(Co, Zr)7 magnet powders have been investigated with respect to hard magnetic properties. Hard magnetic properties are found to be strongly dependent upon the processing condition (like milling time, annealing temperature, etc.). Optimal coercivity Hci of value above 21 kOe has been obtained in Sm12.5Co85.5Zr2 magnet powders subjected to milling for 5 hr and annealing at 600°C for 20min. Optimal remanent magnetization Mr of 73.4 emu/g, remanence ratio Mr/Ms of 0.71, and maximum energy products (BH)max of over 13 MGOe have been realized in Sm12.5Co87.5-xZrx (x = 1, 2) magnet powders with grain size of 15-20 nm. The hard magnetic properties are ascribed to the nanosized Sm(Co, Zr)7 phase of the TbCu7 type structure with grain size of 10-20 nm. The enhancement of remanent magnetization may be contributed from the enhanced exchange-coupling interaction between nanosized grains.

UR - http://www.scopus.com/inward/record.url?scp=0035560313&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035560313&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0035560313

VL - 644

SP - L8.4.1-L8.4.6

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

SN - 0272-9172

ER -