NDLI: Modeling of Intergrain Exchange Coupling for Quantitative Predictions of <formula formulatype=inline> <tex Notation=TeX>$delta m$</tex></formula> Plots

Content Provider	IEEE Xplore Digital Library
Author	Neu, V. Biele, R. Singh, A. Schultz, L.
Copyright Year	1965
Abstract	The study of irreversible switching processes via δm-plots is a common experimental technique to assess intergrain interactions in nanoscaled magnetic materials. Theoretical predictions, on the other hand, of the influence of grain size, texture and field direction on the shape and absolute values of δm-plots are missing. In this paper direct intergrain exchange coupling is evaluated in a combined numerical/analytical approach for a model system of two coupled, hard magnetic grains. The influence of grain size and easy axis orientation on the outcome of a δm-analysis is determined quantitatively. As expected from the short range characteristic of direct exchange coupling, the field-integrated δm-signal decreases with increasing grain size. However, whereas directly coupled grains with parallel easy axis orientation possess large positive δm -values, for increasing misorientation angle the integrated δm-signal reduces and reaches even negative values. Such an effect of negative δm is so far only associated with indirect magnetostatic interactions. In a statistical extension of the model, grain ensembles with Gaussian distribution of their texture axis along one well defined sample direction are examined. The shape, width and height of the calculated δm-plots bear characteristic features known from experimental studies on nanocrystalline, well textured SmCo₅ films.
Sponsorship	IEEE Magnetics Society
Starting Page	2331
Ending Page	2333
Page Count	3
File Size	280835
File Format	PDF
ISSN	00189464
Volume Number	46
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Predictive models Grain size Shape Couplings Magnetostatics Magnetic switching Nanostructured materials Magnetic materials Coupled mode analysis Magnetic analysis remanence analysis Intergrain exchange coupling $\delta m$ -plot nanocrystalline hard magnets
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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