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Related Experiment Video

Updated: May 31, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Overcoming Size-Dependent Magnetic Thermal Stability via Atomical Coherence.

Ao Chen¹, Yuting Tang¹, Zhengdong Cheng²

¹Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China.

Journal of the American Chemical Society

|May 29, 2026

Summary

This summary is machine-generated.

Stabilizing nanoscale magnets requires overcoming thermal energy. Researchers enhanced magnetic anisotropy in FePt@MnO nanoparticles, significantly increasing their blocking temperature for stable magnetic order.

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Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

Area of Science:

Materials Science
Nanotechnology
Condensed Matter Physics

Background:

Ferromagnetic order in nanoscale magnets requires breaking time-reversal symmetry, where magnetic anisotropy energy (KeffV) must exceed thermal fluctuation energy (kBT).
Miniaturization faces the superparamagnetic limit (KeffV = kBT at blocking temperature, TB).

Purpose of the Study:

To concurrently enhance both magnetocrystalline and surface anisotropies in core-shell FePt@MnO nanoparticles.
To overcome the superparamagnetic limit for improved magnetic stability in nanoscale magnets.

Main Methods:

Fabrication of core-shell FePt@MnO nanoparticles with an atomically coherent interface, accommodating a 14% lattice mismatch.
Characterization of magnetic properties, including effective magnetic anisotropy (Keff) and blocking temperature (TB).
Investigation of the anomalous vertical exchange-bias effect to confirm anisotropy enhancement.

Main Results:

Achieved concurrent enhancement of magnetocrystalline and surface anisotropies via an atomically coherent FePt-MnO interface.
Boosted effective magnetic anisotropy (Keff ≈ 8.0 × 10^6 J/m^3) in 2 nm FePt cores, approaching bulk values.
Increased the blocking temperature (TB) to 130 K, a 13-fold increase over bare FePt, extending magnetic stability to room temperature.

Conclusions:

Atomically coherent interfaces in FePt@MnO nanoparticles effectively enhance magnetic anisotropy and stability.
The achieved blocking temperature surpasses MnO's Néel temperature, enabling room-temperature operation.
This approach broadens the applicability of nanoscale magnets in ultrahigh-density recording and medical technologies.