A magnetic memory device includes a magnetic pattern, a reference pattern, a tunnel barrier pattern interposed between the magnetic pattern and the reference pattern, and at least one magnetic segment disposed inside the magnetic pattern. The nitride layer is oxidized to form a nitrided silicon oxide layer comprising an oxide layer beneath the nitride layer. A first hard region is at the axial forward end of the tooth body and defines at least one distinct cutting edge that has an orientation to engage the stump during operation. The optimized enhancement function is then used to enhance other low quality images of the scene or scene portion. A second period M is determined for the partial scan section according to the time interval p, the first period T, and the number of channels N. Thereafter, if the line exits a diamond test area of each pixel that it touches, the pixel may be lit.