Ultrathin Interface Regime of Core-Shell Magnetic Nanoparticles for Effective Magnetism Tailoring

Seung Ho Moon; Seung Hyun Noh; Jae Hyun Lee; Tae Hyun Shin; Yongjun Lim; Jinwoo Cheon

doi:10.1021/acs.nanolett.6b04016

Ultrathin Interface Regime of Core-Shell Magnetic Nanoparticles for Effective Magnetism Tailoring

Seung Ho Moon, Seung Hyun Noh, Jae Hyun Lee, Tae Hyun Shin, Yongjun Lim, Jinwoo Cheon

Research output: Contribution to journal › Article › peer-review

54 Citations (Scopus)

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 (H_C). We found that ESC arises not from the typical hard-soft exchange coupling but rather from the large magnetic surface anisotropy (K_S) 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.

Original language	English
Pages (from-to)	800-804
Number of pages	5
Journal	Nano letters
Volume	17
Issue number	2
DOIs	https://doi.org/10.1021/acs.nanolett.6b04016
Publication status	Published - 2017 Feb 8

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

All Science Journal Classification (ASJC) codes

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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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.",

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AU - Moon, Seung Ho

AU - Noh, Seung Hyun

AU - Lee, Jae Hyun

AU - Shin, Tae Hyun

AU - Lim, Yongjun

AU - Cheon, Jinwoo

PY - 2017/2/8

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Ultrathin Interface Regime of Core-Shell Magnetic Nanoparticles for Effective Magnetism Tailoring

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

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