Investigations of microstructure of thin TbFeCo films by high-resolution electron microscopy (abstract)

Z. G. Li, David Smith, E. E. Marinero

Research output: Contribution to journalArticle

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Abstract

High-resolution electron microscopy has been applied to the study of the microstructure of TbFeCo alloys. Recently, we reported on the presence of microcrystals (2.5-7.5 nm) in sputter-deposited TbFeCo alloys,1 but their possible role in influencing the magnetic properties of these alloys is not yet clear. We have conducted further studies on structures consisting of SiN(8.0 nm)/TbFeCo(20 nm)/SiN(12.5 nm)/Si. Observations were made both in top view and cross section using standard techniques such as bright- and dark-field diffraction contrast imaging, as well as high resolution. We have confirmed the presence of nanocrystals in our plan-view observations. In addition, we conducted annealing experiments (ex situ) and recorded changes in magnetic properties such as coercivity. We find after about 36 h annealing time at 200°C that the crystals grow from ∼3 nm to about 20 nm. The H c change was measured to be -35%, but it is noted that most of the change occurred within the first 100 s (-25%). We will conduct further measurements to investigate whether the nanocrystallites are related in any way to the magnetic anisotropy of these alloys.

Original languageEnglish (US)
Pages (from-to)5954
Number of pages1
JournalJournal of Applied Physics
Volume67
Issue number9
DOIs
StatePublished - 1990

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electron microscopy
microstructure
high resolution
thin films
magnetic properties
annealing
microcrystals
coercivity
nanocrystals
anisotropy
cross sections
diffraction
crystals

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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Investigations of microstructure of thin TbFeCo films by high-resolution electron microscopy (abstract). / Li, Z. G.; Smith, David; Marinero, E. E.

In: Journal of Applied Physics, Vol. 67, No. 9, 1990, p. 5954.

Research output: Contribution to journalArticle

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abstract = "High-resolution electron microscopy has been applied to the study of the microstructure of TbFeCo alloys. Recently, we reported on the presence of microcrystals (2.5-7.5 nm) in sputter-deposited TbFeCo alloys,1 but their possible role in influencing the magnetic properties of these alloys is not yet clear. We have conducted further studies on structures consisting of SiN(8.0 nm)/TbFeCo(20 nm)/SiN(12.5 nm)/Si. Observations were made both in top view and cross section using standard techniques such as bright- and dark-field diffraction contrast imaging, as well as high resolution. We have confirmed the presence of nanocrystals in our plan-view observations. In addition, we conducted annealing experiments (ex situ) and recorded changes in magnetic properties such as coercivity. We find after about 36 h annealing time at 200°C that the crystals grow from ∼3 nm to about 20 nm. The H c change was measured to be -35{\%}, but it is noted that most of the change occurred within the first 100 s (-25{\%}). We will conduct further measurements to investigate whether the nanocrystallites are related in any way to the magnetic anisotropy of these alloys.",
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