Asymmetric trailing shield writer for shingled magnetic recording (smr)

A magnetic head, comprising:

• a main pole adapted for producing a writing magnetic field;
• a trailing shield positioned on a trailing side of the main pole, wherein a trailing gap is positioned between the trailing shield and the main pole;
• and
• a side shield positioned on at least one side of the main pole in a cross-track direction, wherein a side gap is positioned between the side shield and the main pole,
• wherein the main pole has an asymmetrical shape at an air bearing surface (ABS) thereof,
• wherein the asymmetrical shape comprises four apexes, and
• wherein at least three of the apexes are positioned on a centerline of the main pole and/or to a first side of the centerline of the main pole in a cross-track direction.