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A new concept of controlling magnetism in bulk ferromagnets via reversible lithium chemistry is illustrated. The approach bridges electrochemistry with magnetism and is pertinent to any volume of an intercalation‐friendly ferromagnetic material. An iron oxide (maghemite) nanoparticle ensemble, chosen as a representative system, shows a fully reversible and large variation of saturation magnetization...
An extension in magnetoelectric effects is proposed to include reversible chemistry‐controlled magnetization variations. This ion‐intercalation‐driven magnetic control can be fully reversible and pertinent to bulk material volumes. The concept is demonstrated for ferromagnetic iron oxide where the intercalated lithium ions cause valence change and partial redistribution of Fe3+ cations yielding a...
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