POWDER FOR THE LOWER LAYER OF A MAGNET RECORDING MEDIUM OF THE TYPE OF COATING AND MAGNETIC RECORDIN

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The powder comprises needle-like iron oxide particles of average major-axis length in the range 20-200 nm. The powder exhibits a specific surface area measured by the BET adsorption method of 30-100 m 2>/g and the particle pH is 7 or less. An independent claim is included for a coated magnetic recording medium.