title: Distinct universality classes of domain wall roughness in two-dimensional Pt/Co/Pt films.
abstract: We demonstrate here that the current-driven domain wall (DW) in two dimensions forms a "facet" roughness, distinctive to the conventional self-affine roughness induced by a magnetic field. Despite the different universality classes of these roughnesses, both the current- and field-driven DW speed follow the same creep law only with opposite angular dependences. Such angular dependences result in a stable facet angle, from which a single DW image can unambiguously quantify the spin-transfer torque efficiency, an essential parameter in DW-mediated nanodevices.
authors.affiliation: CSO and Department of Physics, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Kyoung-Woong
authors.initials: KW
authors.lastname: Moon
authors.forename: Duck-Ho
authors.initials: DH
authors.lastname: Kim
authors.forename: Sang-Cheol
authors.initials: SC
authors.lastname: Yoo
authors.forename: Cheong-Gu
authors.initials: CG
authors.lastname: Cho
authors.forename: Sungmin
authors.initials: S
authors.lastname: Hwang
authors.forename: Byungnam
authors.initials: B
authors.lastname: Kahng
authors.forename: Byoung-Chul
authors.initials: BC
authors.lastname: Min
authors.forename: Kyung-Ho
authors.initials: KH
authors.lastname: Shin
authors.forename: Sug-Bong
authors.initials: SB
authors.lastname: Choe