Dual magnetic head for reading and writing information at high and low track density including erase gaps having an undulating shape

A dual magnetic head comprising:

• a first read/write core including a first read/write gap having a first gap width, and extending in a first direction which is a direction in which tracks to be formed on a magnetic recording medium extend;
• a second read/write core including a second read/write gap having a second gap width greater than said first gap width, and juxtaposed to said first read/write core in a second direction substantially perpendicular to said first direction;
• magnetic shield means provided between said first read/write core and said second read/write core;
• and
• an erase core having a pair of erase gaps located at opposite ends of said second read/write gap with respect to said second direction, said erase core being juxtaposed to said first read/write core in said second direction and juxtaposed to said second read/write core in said first direction, at least one of facing surfaces of said erase core, which define said erase gaps therebetween, being provided with an undulating shape, wherein said first read/write core has a length less than a total length of said second read/write core and said erase core, as measured in said first direction.