μSR studies on magnetism in High-T_c cuprates

Since the discovery of high-T_c superconductivity in cuprates, muon spin relaxation (μSR) measurements have greatly contributed to the understanding of high-T_c superconductivity. In this paper, μSR studies on the magnetism in high-T_c cuprates obtained these past three decades are reviewed. Antiferromagnetic long-range order, 1/8 anomaly, stripes of Cu spins and holes, impurity-induced magnetism, magnetic-field-induced magnetism, pseudogap, ferromagnetism in the heavily overdoped regime, and undoped superconductivity in TA-type cuprates are discussed. Moreover, the fundamentals of μSR measurements for the study of magnetism are described for μSR beginners.