Control of defects and magnetic properties in colloidal HfO2 nanorods

Einat Tirosh; Gil Markovich

doi:10.1002/adma.200602222

Control of defects and magnetic properties in colloidal HfO₂ nanorods

Einat Tirosh^*
, Gil Markovich

^*Corresponding author for this work

School of Chemistry

Tel Aviv University

Research output: Contribution to journal › Article › peer-review

80 Scopus citations

Abstract

The synthesis of HfO₂ nanorods by the methods of Tang et al was investigated. The nanorods produced were (9.2±1.4) nm in length and (3.5±0.8) nm in diameter. The X-ray diffraction (XRD) patterns confirmed the moniclinic crystalline phase of the nanorods produced in both syntheses. The lattice parameters of both synthesis products were larger than the bulk HfO₂ values. High resolution TEM (HRTEM) revealed larger variations in lattice spacing and orientations within the particles produced by synthesis II. The low-temperature coercivity of the ferromagnetic nanorods was ca. 300 Oe, which is larger than the 50 Oe coercivity obtained by Coey. It was observed that by modifying HfO₂ nanorods synthesis it is possible to increase the defect concentration to a high enough level to produce ferromagnetic coupling in a small fraction of the nanocrystals.

Original language	English
Pages (from-to)	2608-2612
Number of pages	5
Journal	Advanced Materials
Volume	19
Issue number	18
DOIs	https://doi.org/10.1002/adma.200602222
State	Published - 17 Sep 2007

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abstract = "The synthesis of HfO2 nanorods by the methods of Tang et al was investigated. The nanorods produced were (9.2±1.4) nm in length and (3.5±0.8) nm in diameter. The X-ray diffraction (XRD) patterns confirmed the moniclinic crystalline phase of the nanorods produced in both syntheses. The lattice parameters of both synthesis products were larger than the bulk HfO2 values. High resolution TEM (HRTEM) revealed larger variations in lattice spacing and orientations within the particles produced by synthesis II. The low-temperature coercivity of the ferromagnetic nanorods was ca. 300 Oe, which is larger than the 50 Oe coercivity obtained by Coey. It was observed that by modifying HfO2 nanorods synthesis it is possible to increase the defect concentration to a high enough level to produce ferromagnetic coupling in a small fraction of the nanocrystals.",

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N2 - The synthesis of HfO2 nanorods by the methods of Tang et al was investigated. The nanorods produced were (9.2±1.4) nm in length and (3.5±0.8) nm in diameter. The X-ray diffraction (XRD) patterns confirmed the moniclinic crystalline phase of the nanorods produced in both syntheses. The lattice parameters of both synthesis products were larger than the bulk HfO2 values. High resolution TEM (HRTEM) revealed larger variations in lattice spacing and orientations within the particles produced by synthesis II. The low-temperature coercivity of the ferromagnetic nanorods was ca. 300 Oe, which is larger than the 50 Oe coercivity obtained by Coey. It was observed that by modifying HfO2 nanorods synthesis it is possible to increase the defect concentration to a high enough level to produce ferromagnetic coupling in a small fraction of the nanocrystals.

AB - The synthesis of HfO2 nanorods by the methods of Tang et al was investigated. The nanorods produced were (9.2±1.4) nm in length and (3.5±0.8) nm in diameter. The X-ray diffraction (XRD) patterns confirmed the moniclinic crystalline phase of the nanorods produced in both syntheses. The lattice parameters of both synthesis products were larger than the bulk HfO2 values. High resolution TEM (HRTEM) revealed larger variations in lattice spacing and orientations within the particles produced by synthesis II. The low-temperature coercivity of the ferromagnetic nanorods was ca. 300 Oe, which is larger than the 50 Oe coercivity obtained by Coey. It was observed that by modifying HfO2 nanorods synthesis it is possible to increase the defect concentration to a high enough level to produce ferromagnetic coupling in a small fraction of the nanocrystals.

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Control of defects and magnetic properties in colloidal HfO₂ nanorods

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