Anisotropic Magnetoresistance in Fe-Co-Ni Alloys

Anisotropic magnetoresistance: materials, models and applications

“…With the caveat of the residual resistivity being very low, we note that extremal values of (relative) AMR, achieved for (Ni 80 Co 20 ) 86 Fe 14 reach and . For K 2 there is an increase leading to a sign change to positive values with increasing Fe and Co [ 19 ]. This is consistent with other measurements reporting AMR of up to 50% in NiCoFe alloys with a maximum at Ni 80 Co 20 Fe 5 [ 95 ].…”

“…In the FeNi alloys, a maximum AMR ( K 1 ) of approximately 35% is achieved at approximately 10–15% Fe. Permalloy shows an AMR of 25% [ 19 ]. In the second case of the iron-based alloys by Berger et al [ 20 ], the AMR is split into an impurity-based AMR contribution (Δ ρ / ρ ) im and a phonon-based contribution (Δ ρ / ρ ) ph .…”

“…AMR for other concentrations of Pd in Co-Pd are listed in table 1 of Jen [18], where the given composition Co 45 Pd 55 shows the maximum value. A broader listing of the nickel-based alloys FeNi, CoNi and (CoNi)Fe is found in [19] and of the ironbased alloys NiFe, FeCr, FeV and FeCo in fig. 1b and fig.…”

“…Composition-dependent studies of the AMR ratio in the nickel-rich alloys Fe x Ni 1−x , Co x Ni 1−x and (Co x Ni 1−x ) 86 Fe 14 were carried out by Ishio et al [19] and in the iron-rich alloys NiFe and FeCo by Berger et al [20]. In the first case (bulk monocrystals of Ni-rich alloys), Ishio et al report the AMR ratio for two different current directions [001] (which they call K 1 ) and [111] (which they call K 2 ), and their large difference implies that, in terms of equation (2.4), the crystalline AMR is larger than the more commonly measured non-crystalline term in equation (1.1).…”

“…1 a Co 0.3–3.5 from El-Tahawy et al [ 24 ]; fig. 1 in [ 25 ] Ni with Pd 2 T = 4.2 K; impurity without VBS [ 16 ] Ni with Zn 6.5 low temperature; impurity without VBS [ 16 ] Ni with Cr −0.28 T = 4.2 K; impurity with VBS [ 16 ] Co with 3% Ir −2.56 RT; [ 17 ] Co 45 Pd 55 7.96 T = 4 K; [ 18 ] Ni 80 Fe 20 (permalloy) 16–25 LT and RT [ 20 ]; T = 10 K [ 19 ] (Ni 100− x Co x ) 86 Fe 14 in excess of 50 for % [ 19 ], see discussion in text Ni 77 Fe 22 Cr 2 0.76 T = 4.2 K; [ 21 ] …”