Pulse and low temperature magnetometry of y-fe2o3 dispersions

S. J. Greaves; C. P. Hancock; K. O'Grady

doi:10.1109/20.539256

Pulse and low temperature magnetometry of y-fe₂o₃ dispersions

S. J. Greaves, C. P. Hancock, K. O'Grady

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University of Alabama

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Abstract

Water and organic based dispersions of a γ-Fe₂O₃ pigment have been prepared and measured using low temperature and pulsed field magnetometry. The objective of the study is to examine the role of dynamic effects in pulsed field measurements by comparison with low temperature studies where no such effects can occur. We find that fast pulsed fields t<100 jis effectively freeze the dispersion and enable studies of magnetic properties to be made without affecting the microstructure. Additionally, rémanente curves and hysteresis loops have been measured at low temperatures to determine changes to the microstructure of the dispersion brought about by milling. 5M plots showed an increase in negative interactions with milling time for the organic based dispersion but a decrease in these interactions for the water based dispersion.

Original language	English
Pages (from-to)	4040-4042
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	32
Issue number	5 PART 1
DOIs	https://doi.org/10.1109/20.539256
Publication status	Published - 1996

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title = "Pulse and low temperature magnetometry of y-fe2o3 dispersions",

abstract = "Water and organic based dispersions of a γ-Fe2O3 pigment have been prepared and measured using low temperature and pulsed field magnetometry. The objective of the study is to examine the role of dynamic effects in pulsed field measurements by comparison with low temperature studies where no such effects can occur. We find that fast pulsed fields t<100 jis effectively freeze the dispersion and enable studies of magnetic properties to be made without affecting the microstructure. Additionally, r{\'e}manente curves and hysteresis loops have been measured at low temperatures to determine changes to the microstructure of the dispersion brought about by milling. 5M plots showed an increase in negative interactions with milling time for the organic based dispersion but a decrease in these interactions for the water based dispersion.",

author = "Greaves, {S. J.} and Hancock, {C. P.} and K. O'Grady",

note = "Funding Information: Manuscript received February 29, 1996. A. M. Lane, e-mail alane@coe.eng.ua.edu, fax 205-348-9659. Lane acknowledges partial funding under the co-operative agreement CR82296 1-01-0 with the Risk Reduction Engineering Laboratory, US EPA and partial hndmg by NSF-MRSEC Grant Number DMR-9400399. Greaves, Hancock and 0{\textquoteright}C;rady acknowledge support from the Engineering and Physical Science Research Council. The contents do not necessarily reflect the views and policies of the sponsors. The mention of trade names or comxnercial products does not constitute endorsement or recommendation for use.",

year = "1996",

doi = "10.1109/20.539256",

language = "English",

volume = "32",

pages = "4040--4042",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Pulse and low temperature magnetometry of y-fe2o3 dispersions

AU - Greaves, S. J.

AU - Hancock, C. P.

AU - O'Grady, K.

N1 - Funding Information: Manuscript received February 29, 1996. A. M. Lane, e-mail alane@coe.eng.ua.edu, fax 205-348-9659. Lane acknowledges partial funding under the co-operative agreement CR82296 1-01-0 with the Risk Reduction Engineering Laboratory, US EPA and partial hndmg by NSF-MRSEC Grant Number DMR-9400399. Greaves, Hancock and 0’C;rady acknowledge support from the Engineering and Physical Science Research Council. The contents do not necessarily reflect the views and policies of the sponsors. The mention of trade names or comxnercial products does not constitute endorsement or recommendation for use.

PY - 1996

Y1 - 1996

N2 - Water and organic based dispersions of a γ-Fe2O3 pigment have been prepared and measured using low temperature and pulsed field magnetometry. The objective of the study is to examine the role of dynamic effects in pulsed field measurements by comparison with low temperature studies where no such effects can occur. We find that fast pulsed fields t<100 jis effectively freeze the dispersion and enable studies of magnetic properties to be made without affecting the microstructure. Additionally, rémanente curves and hysteresis loops have been measured at low temperatures to determine changes to the microstructure of the dispersion brought about by milling. 5M plots showed an increase in negative interactions with milling time for the organic based dispersion but a decrease in these interactions for the water based dispersion.

AB - Water and organic based dispersions of a γ-Fe2O3 pigment have been prepared and measured using low temperature and pulsed field magnetometry. The objective of the study is to examine the role of dynamic effects in pulsed field measurements by comparison with low temperature studies where no such effects can occur. We find that fast pulsed fields t<100 jis effectively freeze the dispersion and enable studies of magnetic properties to be made without affecting the microstructure. Additionally, rémanente curves and hysteresis loops have been measured at low temperatures to determine changes to the microstructure of the dispersion brought about by milling. 5M plots showed an increase in negative interactions with milling time for the organic based dispersion but a decrease in these interactions for the water based dispersion.

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JF - IEEE Transactions on Magnetics

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ER -

Pulse and low temperature magnetometry of y-fe₂o₃ dispersions

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