2006
DOI: 10.1063/1.2337783
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Transmission electron microscopy study of CoFe films with high saturation magnetization

Abstract: Transmission electron microscopy ͑TEM͒ has been used to study magnetization processes in four high moment CoFe films. While all films were of similar total thickness, 50 nm, the differences between them were the inclusion or otherwise of a seed layer and the introduction of nonmagnetic spacers to form laminated films. The detailed reversal mechanism for easy and hard axis reversals of each film was investigated. As expected cross-tie walls were observed in the films with thicker CoFe layers and wall displaceme… Show more

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Cited by 15 publications
(18 citation statements)
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“…Our points are too sparse to validate a D 6 behaviour but qualitatively one can see two regimes of coercivity that may be explained by the random anisotropy model. A previous study [3] has shown that by laminating a CoFe film one can decrease H c . This was for two reasons.…”
Section: Article In Pressmentioning
confidence: 98%
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“…Our points are too sparse to validate a D 6 behaviour but qualitatively one can see two regimes of coercivity that may be explained by the random anisotropy model. A previous study [3] has shown that by laminating a CoFe film one can decrease H c . This was for two reasons.…”
Section: Article In Pressmentioning
confidence: 98%
“…Vopsaroiu et al [2] used a novel High Target Utilisation Sputtering System (HiTUS) sputtering system to control the grain size of CoFe films and found that they could reduce the coercivity to 10 Oe for films with grains sizes less than 15 nm. Craig et al [3] fabricated CoFe films laminated with Al 2 O 3 and investigated the magnetisation reversal in the samples with Lorentz microscopy. They found that laminated samples had a smaller coercivity than single-layer films and attributed this to a lower grain size, but more importantly uncorrelated growth of crystallites in individual layers, leading to a reduction in the local anisotropy.…”
Section: Introductionmentioning
confidence: 99%
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“…Previous studies have attempted to reduce the coercivity by using seed layers, 1,2 control of grain size, 3 and lamination using insulating layers. 4 Jung et al 1 studied the use of different seed layers and found that by using Cu, Ru, and Ta/ NiFe, the typical high coercivities could be reduced. This was attributed to a reduction of the grain size in the CoFe layer.…”
Section: Introductionmentioning
confidence: 99%
“…Vopsaroiu et al 3 used a novel high target utilization sputtering system ͑HiTUS͒ to control the grain size in CoFe films and found that they could reduce the coercivity to 10 Oe for films with grain sizes less than 15 nm. Craig et al 4 fabricated CoFe films laminated with Al 2 O 3 and investigated the magnetization reversal in the samples with Lorentz microscopy. They found that laminated samples had a smaller coercivity than single layer films and attributed this to a lower grain size in the CoFe but mainly to uncorrelated growth of crystallites within individual layers, leading to a reduction in the local anisotropy.…”
Section: Introductionmentioning
confidence: 99%