Peter Grünberg ( May 18 , 1939 ) is a German physicist , and Nobel Prize in Physics laureate for his consequential discovery with Albert Fert of giant magnetoresistance which brought about a breakthrough in gigabyte hard disks .
Peter Grünberg ( May 18 , 1939 ) is a German physicist . 
 He is one of the discoverers of giant magnetoresistance which brought about a breakthrough in gigabyte hard disks .