Absence of room temperature ferromagnetism in bulk Mn-doped ZnO
S. Kolesnik, B. Dabrowski
TL;DR
This study investigates the magnetic properties of Mn-doped ZnO and finds no evidence of room temperature ferromagnetism in bulk samples, contradicting previous reports, with samples exhibiting paramagnetic behavior instead.
Contribution
The paper provides a systematic analysis showing the absence of ferromagnetism in bulk Mn-doped ZnO synthesized at high temperatures, challenging prior claims.
Findings
No bulk ferromagnetism observed in single-phase samples
Samples exhibit paramagnetic Curie-Weiss behavior
Unreacted Mn oxides present in low-temperature synthesis
Abstract
Structural and magnetic properties have been studied for polycrystalline Zn_1-xMn_xO (x=0.02, 0.03, 0.05). Low-temperature (~500 oC) synthesis leaves unreacted starting ZnO and manganese oxides. Contrary to a recent report, no bulk ferromagnetism was observed for single-phase materials synthesized in air at temperatures above 900 oC. Single-phase samples show paramagnetic Curie-Weiss behavior.
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