title: Ultrathin Interface Regime of Core-Shell Magnetic Nanoparticles for Effective Magnetism Tailoring.
abstract: The magnetic exchange coupling interaction between hard and soft magnetic phases has been important for tailoring nanoscale magnetism, but spin interactions at the core-shell interface have not been well studied. Here, we systematically investigated a new interface phenomenon termed enhanced spin canting (ESC), which is operative when the shell thickness becomes ultrathin, a few atomic layers, and exhibits a large enhancement of magnetic coercivity (HC). We found that ESC arises not from the typical hard-soft exchange coupling but rather from the large magnetic surface anisotropy (KS) of the ultrathin interface. Due to this large increase in magnetism, ultrathin core-shell nanoparticles overreach the theoretical limit of magnetic energy product ((BH)max) and exhibit one of the largest values of specific loss power (SLP), which testifies to their potential capability as an effective mediator of magnetic energy conversion.
authors.affiliation: Center for Nanomedicine, Institute for Basic Science (IBS) , Seoul 03722, Republic of Korea.|Yonsei-IBS Institute, Yonsei University , Seoul 03722, Republic of Korea.|Department of Chemistry, Yonsei University , Seoul 03722, Republic of Korea.
authors.forename: Seung Ho
authors.initials: SH
authors.lastname: Moon
authors.affiliation: Center for Nanomedicine, Institute for Basic Science (IBS) , Seoul 03722, Republic of Korea.|Yonsei-IBS Institute, Yonsei University , Seoul 03722, Republic of Korea.|Department of Chemistry, Yonsei University , Seoul 03722, Republic of Korea.
authors.forename: Seung-Hyun
authors.initials: SH
authors.lastname: Noh
authors.affiliation: Center for Nanomedicine, Institute for Basic Science (IBS) , Seoul 03722, Republic of Korea.|Yonsei-IBS Institute, Yonsei University , Seoul 03722, Republic of Korea.|Department of Chemistry, Yonsei University , Seoul 03722, Republic of Korea.
authors.forename: Jae-Hyun
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Center for Nanomedicine, Institute for Basic Science (IBS) , Seoul 03722, Republic of Korea.|Yonsei-IBS Institute, Yonsei University , Seoul 03722, Republic of Korea.|Department of Chemistry, Yonsei University , Seoul 03722, Republic of Korea.
authors.forename: Tae-Hyun
authors.initials: TH
authors.lastname: Shin
authors.affiliation: Center for Nanomedicine, Institute for Basic Science (IBS) , Seoul 03722, Republic of Korea.|Yonsei-IBS Institute, Yonsei University , Seoul 03722, Republic of Korea.|Department of Chemistry, Yonsei University , Seoul 03722, Republic of Korea.
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Lim
authors.affiliation: Center for Nanomedicine, Institute for Basic Science (IBS) , Seoul 03722, Republic of Korea.|Yonsei-IBS Institute, Yonsei University , Seoul 03722, Republic of Korea.|Department of Chemistry, Yonsei University , Seoul 03722, Republic of Korea.
authors.forename: Jinwoo
authors.identifier: 0000-0001-8948-5929
authors.initials: J
authors.lastname: Cheon
keywords: Hard−soft exchange coupling; core−shell magnetic nanoparticle; magnetic anisotropy; magnetic energy product; shell-thickness control; surface canted spins