Methods of lapping while heating one or more features, and related sliders, row bars, and systems

A method of lapping a row bar having a plurality of sliders, wherein the method comprises:

• a) providing the row bar having a plurality of sliders, wherein at least one slider comprises a transducer region comprising:
• at least a first magnetoresistive element and a second magnetoresistive element, wherein the first magnetoresistive element has a first feature that has a first distance from a first target value in a lapping direction and the second magnetoresistive element has a second feature that has a second distance from a second target value in the lapping direction, wherein the first distance minus the second distance is equal to a delta distance;
• and
• b) applying a current to an element in the transducer region to generate heat and cause at least the first magnetoresistive element to expand in the lapping direction relative to the second magnetoresistive element, wherein the current is controlled to cause the first magnetoresistive element to expand in the lapping direction an amount equal to the delta distance;
• and
• c) lapping the row bar while applying the current.