▁elect romagnet ▁and ▁a ▁static ▁field . ▁To ▁produce ▁this ▁static ▁field , ▁it ▁is ▁important ▁to ▁use ▁the ▁right ▁material . ▁In ▁ME MS , ▁permanent ▁magnet s ▁have ▁become ▁the ▁favorite ▁because ▁they ▁have ▁a ▁very ▁good ▁scaling ▁factor ▁and ▁they ▁retain ▁their ▁magnet ization ▁even ▁when ▁there ▁is ▁no ▁external ▁field ... ▁meaning ▁that ▁they ▁need ▁not ▁be ▁continu ously ▁magnet ized ▁when ▁they ▁are ▁in ▁use ▁ ▁Integr ating ▁the ▁magnet ▁into ▁the ▁ME MS ▁device ▁As ▁earlier ▁discussed , ▁ME MS ▁devices ▁are ▁designed ▁and ▁fabric ated ▁using ▁special ▁micro - fab ric ation ▁techniques . ▁The ▁major ▁challenge ▁however ▁for ▁magnetic ▁ME MS ▁is ▁the ▁integration ▁of ▁the ▁magnet ▁into ▁the ▁ME MS ▁device . ▁Rec ent ▁research ▁has ▁suggested ▁solutions ▁to ▁this ▁challenge . ▁ ▁Fab ric ation ▁( or ▁m old ing ) ▁of ▁the ▁magnet ▁There ▁are ▁several ▁ways ▁by ▁which ▁the ▁magnet ▁could ▁be ▁fabric ated ▁on ▁a ▁ME MS ▁structure : ▁▁ ▁S put ter ing : ▁Arg on ▁ion ▁bomb ard ment ▁of ▁the ▁material ▁release ▁particles ▁of ▁the ▁material . ▁Main ly ▁for ▁depos iting ▁rare ▁earth ▁magnet s . ▁De position ▁rate ▁and ▁film ▁surface ▁area ▁depend ▁on ▁s put ter ing ▁tool ▁and ▁target ▁size ▁▁ ▁P uls ed ▁L ayer ▁De position : ▁a ▁high - power ▁p uls ed ▁las er ▁beam ▁is ▁focused ▁inside ▁a ▁vac u um ▁chamber ▁to ▁strike ▁a ▁target ▁of ▁the ▁material ▁that ▁is ▁to ▁be ▁depos ited ▁ ▁Elect ro