Abstract
On single crystal Zn 2 Y , the experimental linewidth induced by surface imperfections is compared with the theoretical one. The theoretical calculation is made in consideration of dipole and quadrupole demagnetizations of the imperfections and with the use of the effective exchange constants D ⊥ =0.15×10 -9 Oe cm 2 and D // =9.3×10 -9 Oe cm 2 within and between the crystallographic c planes. The experimental linewidth agrees well with this calculation rather than the other two results calculated by Sparks-Loudon-Kittel and Seiden-Sparks methods. The ratio of the quadrupole contribution to the dipole increases with decrease of polishing grit size. The extended calculation for the higher order multipoles than the quadrupole achieves the more precise approach of the calculated linewidth to the experimental one.
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