Patent ID: 8342383

Claim:
A method of forming a sputter target assembly, comprising the steps of: providing a backing plate having a top surface, and pre-wetting the top surface with a solder layer; providing a ferromagnetic sputter target, without a taper, with a substantially even magnetic permeability throughout the material having a bottom surface, and pre-wetting the bottom surface with a solder layer; introducing a bonding foil, between the backing plate and the ferromagnetic sputter target, wherein the bonding foil is an ignitable heterogeneous stratified structure for the propagation of an exothermic reaction; pressing the backing plate and the ferromagnetic sputter target together and igniting the bonding foil, therebetween to melt and bond the solder layer on the backing plate with the solder layer on the ferromagnetic sputter target without affecting the microstructure or flatness of the ferromagnetic sputter target in the formation of the sputter target assembly with a substantially symmetric magnetic leakage flux.