| abstract |
Co with 0.5 to 8 atomic% based on total Fe, 5-10 atomic% Al based on total Fe, 0.18 to 0.30 μm average long axis diameter, and particle size below 0.22 (standard deviation / average long axis diameter) ), Spindle-type goethite particles having an average uniaxial diameter of 0.025 to 0.045 μm, and an average aspect ratio of 5 to 10. Spindle-type hematite particles and spindle-type magnetite alloy particles are also disclosed and are made from the high etite particles. The spindle-type high etite particles of the present invention have excellent dispersibility (high orthogonality and high degree of orientation) and are excellent in both weather resistance and coercive force distribution, such as household DAT, 8mm, Hi-8 tape, business VTR tape, computer Provided are spindle-shaped magnetite alloy particles useful as a tape or floppy disk. |