Patent ID: 7688537

Claim:
A control method of a magnetic spacing during write operation in magnetic recording, comprising: beginning to apply a current to at least one first heating element at a time advanced by a predetermined period from the start of writing data, the at least one first heating element being contacted with a magnetic pole layer included by at least one write head element, or the at least one first heating element being connected with said magnetic pole layer through at least one thermal conductive layer, the current being applied to protrude said at least one write head element due to thermal expansion; and finishing applying said current at said start of writing data to maintain a constant value of a magnetic spacing after said start of writing data, wherein an electric power supplied to said at least one first heating element has a same level as an electric power supplied to a coil layer included in said at least one write head element during writing data, and said predetermined period is equivalent to a time period between said start of the writing data at which said electric power begins to be supplied to said coil layer and a time at which said magnetic spacing just reaches said constant value.