NDLI: Coercivity Reduction in Nickel Ferrite (NiFe<formula formulatype=inline><tex Notation=TeX>$_{2}$</tex></formula>O <formula formulatype=inline><tex Notation=TeX>$_{4}$</tex></formula>) Thin Films Through Surface Patterning

Content Provider	IEEE Xplore Digital Library
Author	Rasic, G. Schwartz, J.
Copyright Year	2010
Abstract	NiFe₂O₄(NFO), a spinel ferrite with high electrical resistivity and favorable magnetic properties, is an interesting material for high-frequency signal and power electronic applications. Here, significant reduction in the coercivity of NFO films is obtained through surface patterning via nanoimprint lithography. Multilayered NFO films are grown on c-plane (0001) sapphire substrates using room temperature chemical solution deposition. Two film variants, layer-by-layer and bulk, are deposited. Prior to crystallization, films are patterned with a polydimethylsiloxane stamp. Good feature transfer to the thin-film surface is confirmed by atomic force microscopy and transmission electron microscopy. Θ-2Θ X-ray diffraction shows that both variants produce single-phase inverse spinel NFO, with better texture in the layer-by-layer samples. Magnetic measurements show substantial reduction in coercivity in the patterned samples due to the surface anisotropy-enhanced demagnetization field. The bulk patterned sample showed the lowest coercivity, ~18 Oe in-plane, albeit with reduced saturation magnetization, whereas the layer-by-layer patterned film maintained the same degree of texture and saturation as unpatterned films, with a ~80% reduction in coercivity. These results show that nanoimprint lithography of chemical solution deposition films is a cost-effective pathway to engineering the coercivity of NFO films while retaining desirable saturation magnetization and texture.
Starting Page	1
Ending Page	4
Page Count	4
File Size	533007
File Format	PDF
ISSN	1949307X
Volume Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coercive force Saturation magnetization Magnetic hysteresis Surface morphology Surface treatment Ferrites Nanolithography nanostructured materials Soft magnetic materials magnetic losses ferromagnetic films
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials

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