KFM
SPM images of the electric-field-induced contrast on a 001 oriented surface of the LSMO-0.11 single crystal obtained after the application of V=−10 V left stripe and V=+10 V right stripe to the tip: a topographic image before poling it does not change after poling, KFM image immediately after poling, PFM image several minutes after poling, and KFM image after prolonged aging 107 h.
R. F. Mamin, I. K. Bdikin, and A. L. Kholkin, Locally induced charged states in La0.89Sr0.11MnO3 single crystals, APPLIED PHYSICS LETTERS 94, 222901 2009, https://aip.scitation.org/doi/10.1063/1.3147163