| abstract |
To provide a hexagonal ferrite magnetic powder in which contaminants due to organic substances and the like are reduced, and a magnetic recording medium using the same. After adding 0.05 g of sample powder to 100 mL of potassium hydroxide solution at pH = 11, 0.10 mol / L nitric acid is added to 100 mL of potassium hydroxide solution at pH = 11 (blank solution) to adjust the pH. A magnetic recording medium is formed using hexagonal ferrite magnetic powder having a pH value indicated when adding an amount of nitric acid of 5 = 5 or more. |