FERRITE COMPOSITION FOR SHIELDING MAGNETIC FIELD AND METHOD FOR MANUFACTURING THE SAME

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The present invention relates to a ferrite composition used as a magnetic field shielding member of a wireless power transmitter, and a manufacturing method thereof. The present invention is selected from Mg, Ni, Zn, Cu, a rare earth element, and Bi; is selected from A, Fe, Mn, and Co which are one or more elements essentially including La; and has B and Al which are one or more elements essentially including Mn as essential elements. A composition ratio of the above Mg, Ni, Zn, Cu, A, Fe, B, and Al is represented by chemical formula 1, Mg_(1-a-b-c)Ni_aZn_bCu_cA_dFe_(2-d-x-y)B_xAl_yO_4. Each of (1-a-b-c), a, b, c, d, (2-d-x-y), x, and y represents a molar ratio of Mg, Ni, Zn, Cu, A, Fe, B, and Al and satisfies the following conditions : 0.03 <= a <= 0.2, 0.45 <= b <= 0.65, 0.15 <= c <= 0.28, 0.01 <= d <= 0.08, 0.01 <= x <= 0.08, 0.01 <= y <= 0.09. According to the present invention, the ferrite composition has an excellent shielding performance even in a thickness thinner than conventional ferrite compositions. It is possible to reduce the weight and thickness of a wireless power transmitter by using the ferrite composition.