Exchange anisotropy in epitaxial Mn/sub 1-x/Pt/sub x/-NiFe bilayers

Exchange anisotropy of (001)-oriented Mn80Ir20/NiFe epitaxial bilayers

“…Previously reported Mn 89 Pt 11 /NiFe bilayers exhibited a large 4y anisotropy of 1.2 Â 10 5 erg/cm 3 which was comparable to its 1y anisotropy of 1.1 Â 10 5 erg/cm 3 [9]. The difference of 4y component between the previous Mn 89 Pt 11 /NiFe and the present Mn 80 Ir 20 / NiFe may be considered to be due to the difference of crystal anisotropy of antiferromagnet. The large 1y component and small rotational hysteresis loss were also reported for polycrystalline Mn 80 Ir 20 / NiFe bilyaers as in Ref.…”

“…Sample construction of (0 0 1) oriented Mn 80 Ir 20 /NiFe bilayers.depends on the crystal orientation of Mn 89 Pt 11 , rather than on the direction of the magnetic field during the growth. However, the previous Mn 89 Pt11 /NiFe showed double shifted M2H loops when the magnetic field was applied along hard directions ½11 0 and ½1 1 0[9,10]. The double shifted loops are not observed in the present Mn 80 Ir 20 /NiFe bilayers as seen fromFig.…”

“…Most of the studies on Mn 50 Pt 50 /ferromagnet and Mn 80 Ir 20 /ferromagnet bilayers have been done with sputtered films but very few have been performed with molecular-beam-epitaxy (MBE) grown bilayers. Thus, we have investigated the [9,10] and (1 1 1) [11] at the substrate temperature T g =room temperature. For (0 0 1)-oriented Mn 89 Pt 11 /NiFe epitaxial bilayers, a large H ex was obtained without heat treatment [9].…”

Exchange anisotropy of MBE grown Mn1−Pt /NiFe bilayers with (0 0 1) orientation

“…Mn 50 Pt 50 / ferromagnet bilayers are known to exhibit a large bias field H ex [3][4][5][6][7][8]. The results of many works done on Mn 50 Pt 50 /ferromagnet bilayers showed that heat treatment is necessary at around 250 C to obtain a large H ex : On the other hand, Saito et al reported that Mn 90 Pt 10 / NiFe bilayers show a large H ex without heat treatment [9,10].We have reported that Mn 90 Pt 10 /NiFe bilayers with (0 0 1) orientation also show a large H ex ; and the M2H loops measured applying field in the hard direction exhibit a double-shifted loop [11].In this study, we have investigated the behavior of the in-plane anisotropy for (0 0 1) oriented Mn 1Àx Pt x (0.06oxo0.40)/NiFe bilayers varying the direction of the magnetic field applied during the deposition.The Pt(2 nm)/Mn 1Àx Pt x (30 nm)/Ni 80 Fe 20 (5 nm)/ Pt(30 nm)/Cr(10 nm) film were grown by molecular beam epitaxy (MBE) onto MgO(0 0 1) substrates at room temperature. The Mn 1Àx Pt x (0.06oxo0.40) layer was deposited by co-evaporation from Mn and Pt sources and the Ni 80 Fe 20 layer was evaporated from an alloy source.…”

“…Mn 50 Pt 50 / ferromagnet bilayers are known to exhibit a large bias field H ex [3][4][5][6][7][8]. The results of many works done on Mn 50 Pt 50 /ferromagnet bilayers showed that heat treatment is necessary at around 250 C to obtain a large H ex : On the other hand, Saito et al reported that Mn 90 Pt 10 / NiFe bilayers show a large H ex without heat treatment [9,10].…”