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(a) DC-demagnetization and isothermal remanent magnetization of 8 nm Co particles measured by SQUID-magnetometry at T = 29 K in in-plane geometry; (b) shows the so-called Henkel plot of the Co NPs on Pt(111) film on Si (black dots) and the result obtained for Co NPs on a Si substrate at T = 10 K (blue squares). The expectation for ideal Stoner–Wohlfarth particles (red line) at T = 0 K is also included.
