Origin of ferromagnetism in Cu-doped ZnO

Scientific Reports
Nasir AliSubhasis Ghosh

Abstract

It is widely reported during last decade on the observation of room temperature ferromagnetism (RTFM) in doped ZnO and other transition metal oxides. However, the origin of RTFM is not understood and highly debated. While investigating the origin of RTFM, magnetic ion doped oxides should be excluded because it is not yet settled whether RTFM is intrinsic or due to the magnetic ion cluster in ZnO. Hence, it is desirable to investigate the origin of RTFM in non-magnetic ion doped ZnO and Cu-doped ZnO will be most suitable for this purpose. The important features of ferromagnetism observed in doped ZnO are (i) observation of RTFM at a doping concentration much below than the percolation threshold of wurtzite ZnO, (ii) temperature independence of magnetization and (iii) almost anhysteretic magnetization curve. We show that all these features of ferromagnetism in ZnO are due to overlapping of bound magnetic polarons (BMPs) which are created by exchange interaction between the spin of Cu2+ ion and spin of the localized hole due to zinc vacancy [Formula: see text]. Both the experimental and theoretical investigation show that the exchange interaction between Cu2+-Cu2+ ions mediated by [Formula: see text] is responsible for RTFM in Cu-...Continue Reading

References

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Citations

Jun 1, 2019·Physical Chemistry Chemical Physics : PCCP·K C VermaR K Kotnala
Aug 20, 2019·Scientific Reports·Y ZhangB Masenelli
Apr 3, 2020·Physical Chemistry Chemical Physics : PCCP·Li WangDenghui Ji
Apr 23, 2020·Scientific Reports·Sahitya V VegesnaHeidemarie Schmidt
Apr 4, 2021·The Journal of Chemical Physics·O Volnianska
Nov 6, 2020··Birendra KumarSubhasis Ghosh

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Methods Mentioned

BETA
X-ray
electron paramagnetic resonance
x-ray diffraction

Software Mentioned

Vienna ab - initio simulation package ( VASP )

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