American Institute of Physics, Journal of Applied Physics, 10(97), p. 10J113
DOI: 10.1063/1.1853711
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We measure surface anisotropy in permalloy (Py) deposited between two layers of normal metal (NM = Ag, Cu, or Ta) by measuring the total perpendicular anisotropy with the angular dependence of the ferromagnetic resonance (FMR) field in a resonant cavity. Comparisons are made with the frequency dependence of a broadband FMR technique and vibrating sample magnetometry, and neither match the sensitivity and range of the cavity technique. We see there is a difference between the surface anisotropy at the interfaces: Py–Ta has a surface anisotropy of (0.078±0.009) mJ/m2 and the Py–Ag and Py–Cu interfaces have surface anisotropies of (0.10±0.007) mJ/m2.