X-ray photoelectron spectroscopy and magnetic force microscopy studies of ion-beam deposited Ni/sub 80/Fe/sub 20//Co-oxide bilayers

Antiferromagnetic Layer Structure Effects on Exchange Coupling Strength in Ion-Beam Deposited Ni80Fe20/Cobalt Oxide Bilayers

“…The magnetic properties of a single NiFe layer, a single Co layer, and Ni 80 Fe 20 /Cobalt oxide bilayers were determined using a VSM. 13) The pure Permalloy layer deposited on Si(100) substrates exhibits a soft magnetic property (H c $ 1 Oe) with in-plane easy magnetization as a result of their shape. Furthermore, the magnetic behavior of Ni 80 Fe 20 layers markedly changes when they are covered by antiferromagnetic CoO, particularly for films prepared with 8% O 2 in the assist beam.…”

“…16,17) The mean roughness of Co-oxide increases with increasing % O 2 , as measured by atomic force microscopy. 13) This may give rise to increased coercivity with increasing % O 2 . Thus, the large coercivity and the absence of the loop shift in our Ni 80 Fe 20 /CoO bilayers are associated with the CoO spins that follow the switching of the ferromagnetic NiFe moment.…”

Enhanced Anisotropic Magnetoresistance of Ion-Beam-Deposited Ni80Fe20–NixFe1-xO Composite Films

“…Ni 80 Fe 20 films (known as permalloy) with a thickness of $500 # A were deposited onto thermally oxidized silicon substrates by a dual-ion-beam deposition system. 10,11) The composite permalloy target was fabricated from an 20 cm round high-purity Ni target (99.9%) filled with Fe pellets. The area fraction of Fe/Ni is approximately 30% to take account of different sputtering yields in Ni and Fe.…”