Patent ID: 7919007
Filing Date: 2011-04-05
Classification: C04B

Abstract:
1. A ferrite magnetic material comprising as a main phase thereof a ferrite phase having a hexagonal structure, the main phase being represented by the following composition formula (1): La x Ca m α 1−x−m (Fe 12−y Co y ) z with α representing one or two of Ba and Sr; wherein the constituent ratios of the metal elements constituting the main phase satisfy the following conditions: x and m are the values in a region bounded by the points, A:(0.53, 0.27), B:(0.64, 0.27), C:(0.64, 0.35), D:(0.53, 0.45), E:(0.47, 0.45) and F:(0.47, 0.32) in the (x, m) coordinates shown in 1.4≦x/yz≦1.71; 9.5≦12z≦11.0; 0.0005≦(1−x−m)/(1−x)≦0.42; wherein the ferrite magnetic material is a ferrite sintered magnet with magnetic properties that Br+(⅓)HcJ is 6200 or more.