title: β-NMR Investigation of the Depth-Dependent Magnetic Properties of an Antiferromagnetic Surface.
abstract: By measuring the prototypical antiferromagnet α-Fe_{2}O_{3}, we show that it is possible to determine the static spin orientation and dynamic spin correlations within nanometers from an antiferromagnetic surface using the nuclear spin polarization of implanted ^{8}Li^{+} ions detected with β-NMR. Remarkably, the first-order Morin spin reorientation in single crystal α-Fe_{2}O_{3} occurs at the same temperature at all depths between 1 and 100 nm from the (110) surface; however, the implanted nuclear spin experiences an increased 1/T_{1} relaxation rate at shallow depths revealing soft-surface magnons. The surface-localized dynamics decay towards the bulk with a characteristic length of ε=11±1  nm, closely matching the finite-size thresholds of hematite nanostructures.
authors.affiliation: Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.|Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.|Chemistry Department, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: D L
authors.initials: DL
authors.lastname: Cortie
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: T
authors.initials: T
authors.lastname: Buck
authors.affiliation: Physik-Department, Technische Universität München, 85748 Garching bei München, Germany.
authors.forename: M H
authors.initials: MH
authors.lastname: Dehn
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: V L
authors.initials: VL
authors.lastname: Karner
authors.affiliation: Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.|Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.|TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: R F
authors.initials: RF
authors.lastname: Kiefl
authors.affiliation: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: C D P
authors.initials: CD
authors.lastname: Levy
authors.affiliation: Chemistry Department, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: R M L
authors.initials: RM
authors.lastname: McFadden
authors.affiliation: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: G D
authors.initials: GD
authors.lastname: Morris
authors.affiliation: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: I
authors.initials: I
authors.lastname: McKenzie
authors.affiliation: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: M R
authors.initials: MR
authors.lastname: Pearson
authors.affiliation: Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2500, Australia.
authors.forename: X L
authors.initials: XL
authors.lastname: Wang
authors.affiliation: Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.|Chemistry Department, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: W A
authors.initials: WA
authors.lastname: MacFarlane