Functionally graded magnetic materials: a perspective to advance charged particle optics through compositional engineering oleh Eric Lang, Zac Milne, Jesse Adamczyk, Erin Barrick, Robert Delaney, Samad Firdosy, Nicholas Ury, R. Peter Dillon, Todd C. Monson, Andrew B. Kustas, Katherine Jungjohann, Khalid Hattar