Spacer materials include ORGANIZATION@1 -LRB- copper -RRB- , and ferromagnetic layers use NiFe -LRB- permalloy -RRB- , which are both widely studied and meet industrial requirements .

Materials used in these layers include Cu -LRB- copper -RRB- , and ferromagnetic layers of NiFe -LRB- permalloy -RRB- , which are both widely studied and meet industrial standards .
