Nanoscale-Driven Crystal Growth of Hexaferrite Heterostructures for Magnetoelectric Tuning of Microwave Semiconductor Integrated Devices
A nanoscale-driven crystal growth of magnetic hexaferrites was successfully demonstrated at low growth temperatures (25–40% lower than the temperatures required often for crystal growth). This outcome exhibits thermodynamic processes of crystal growth, allowing ease in fabrication of advanced multif...
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Veröffentlicht in: | ACS nano 2014-11, Vol.8 (11), p.11172-11180 |
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Hauptverfasser: | , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A nanoscale-driven crystal growth of magnetic hexaferrites was successfully demonstrated at low growth temperatures (25–40% lower than the temperatures required often for crystal growth). This outcome exhibits thermodynamic processes of crystal growth, allowing ease in fabrication of advanced multifunctional materials. Most importantly, the crystal growth technique is considered theoretically and experimentally to be universal and suitable for the growth of a wide range of diverse crystals. In the present experiment, the conical spin structure of Co2 Y ferrite crystals was found to give rise to an intrinsic magnetoelectric effect. Our experiment reveals a remarkable increase in the conical phase transition temperature by ∼150 K for Co2 Y ferrite, compared to 5–10 K of Zn2Y ferrites recently reported. The high quality Co2 Y ferrite crystals, having low microwave loss and magnetoelectricity, were successfully grown on a wide bandgap semiconductor GaN. The demonstration of the nanostructure materials-based “system on a wafer” architecture is a critical milestone to next generation microwave integrated systems. It is also practical that future microwave integrated systems and their magnetic performances could be tuned by an electric field because of the magnetoelectricity of hexaferrites. |
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ISSN: | 1936-0851 1936-086X |
DOI: | 10.1021/nn504714f |