title: Construction of a ³He magnetic force microscope with a vector magnet.
abstract: We constructed a (3)He magnetic force microscope operating at the base temperature of 300 mK under a vector magnetic field of 2-2-9 T in the x-y-z direction. Fiber optic interferometry as a detection scheme is employed in which two home-built fiber walkers are used for the alignment between the cantilever and the optical fiber. The noise level of the laser interferometer is close to its thermodynamic limit. The capabilities of the sub-Kelvin and vector field are demonstrated by imaging the coexistence of magnetism and superconductivity in a ferromagnetic superconductor (ErNi2B2C) at T = 500 mK and by probing a dipole shape of a single Abrikosov vortex with an in-plane tip magnetization.
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, South Korea.
authors.forename: Jinho
authors.initials: J
authors.lastname: Yang
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, South Korea.
authors.forename: Ilkyu
authors.initials: I
authors.lastname: Yang
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, South Korea.
authors.forename: Yun Won
authors.initials: YW
authors.lastname: Kim
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, South Korea.
authors.forename: Dongwoo
authors.initials: D
authors.lastname: Shin
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, South Korea.
authors.forename: Juyoung
authors.initials: J
authors.lastname: Jeong
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, South Korea.
authors.forename: Dirk
authors.initials: D
authors.lastname: Wulferding
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, South Korea.
authors.forename: Han Woong
authors.initials: HW
authors.lastname: Yeom
authors.affiliation: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, South Korea.
authors.forename: Jeehoon
authors.initials: J
authors.lastname: Kim