title: Note: A time-resolved Kerr rotation system with a rotatable in-plane magnetic field.
authors.affiliation: SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Qian
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Gu
authors.forename: Yang
authors.initials: Y
authors.lastname: Ji