Carrier-mediated ferromagnetism vs antiferromagnetic compensation in co-doped ZnS nanoparticles
Patel, Prayas Chandra ; Ghosh, Surajit LU
and Upadhyay, Aditya Narayan
(2026)
In Journal of Physics and Chemistry of Solids
210.
- Abstract
ZnS nanoparticles co-doped with Ni–Cr and Ni–Cu were synthesized by chemical precipitation and systematically examined for structural, optical, magnetic, and magneto-transport properties. All samples retained the cubic zinc blende phase with nanoscale crystallinity. Optical studies showed that Ni doping induced bandgap narrowing through sp-d exchange, while Cu and Cr introduced Burstein-Moss-type widening. Magnetic measurements revealed that Ni–Cr co-doping suppressed ferromagnetism via antiferromagnetic superexchange, whereas Ni–Cu co-doping significantly enhanced room-temperature ferromagnetism, with Ni-rich compositions exhibiting an order-of-magnitude increase in saturation magnetization. Magnetoresistance studies supported these... (More)
ZnS nanoparticles co-doped with Ni–Cr and Ni–Cu were synthesized by chemical precipitation and systematically examined for structural, optical, magnetic, and magneto-transport properties. All samples retained the cubic zinc blende phase with nanoscale crystallinity. Optical studies showed that Ni doping induced bandgap narrowing through sp-d exchange, while Cu and Cr introduced Burstein-Moss-type widening. Magnetic measurements revealed that Ni–Cr co-doping suppressed ferromagnetism via antiferromagnetic superexchange, whereas Ni–Cu co-doping significantly enhanced room-temperature ferromagnetism, with Ni-rich compositions exhibiting an order-of-magnitude increase in saturation magnetization. Magnetoresistance studies supported these trends: Ni–Cr samples showed weak negative MR, while Ni–Cu samples exhibited strong negative MR (up to − 4.2 % at 10 kOe), confirming robust spin-polarized transport. These findings highlight how co-dopant chemistry dictates the balance between antiferromagnetic suppression and carrier-mediated enhancement of ferromagnetism in ZnS, offering valuable guidelines for designing room-temperature diluted magnetic semiconductors for spintronic applications.
(Less)
- author
- Patel, Prayas Chandra
; Ghosh, Surajit
LU
and Upadhyay, Aditya Narayan
- organization
- publishing date
- 2026-03
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Diluted-magnetic-semiconductors, Ferromagnetism, Magnetoresistance, Spintronics, Transition metal co-doping, ZnS nanoparticles
- in
- Journal of Physics and Chemistry of Solids
- volume
- 210
- article number
- 113373
- publisher
- Elsevier
- external identifiers
-
- scopus:105022133966
- ISSN
- 0022-3697
- DOI
- 10.1016/j.jpcs.2025.113373
- language
- English
- LU publication?
- yes
- id
- 5afd70ff-8c84-4d6f-add8-ca1f0ef556e5
- date added to LUP
- 2026-02-10 15:46:00
- date last changed
- 2026-02-10 15:46:22
@article{5afd70ff-8c84-4d6f-add8-ca1f0ef556e5,
abstract = {{<p>ZnS nanoparticles co-doped with Ni–Cr and Ni–Cu were synthesized by chemical precipitation and systematically examined for structural, optical, magnetic, and magneto-transport properties. All samples retained the cubic zinc blende phase with nanoscale crystallinity. Optical studies showed that Ni doping induced bandgap narrowing through sp-d exchange, while Cu and Cr introduced Burstein-Moss-type widening. Magnetic measurements revealed that Ni–Cr co-doping suppressed ferromagnetism via antiferromagnetic superexchange, whereas Ni–Cu co-doping significantly enhanced room-temperature ferromagnetism, with Ni-rich compositions exhibiting an order-of-magnitude increase in saturation magnetization. Magnetoresistance studies supported these trends: Ni–Cr samples showed weak negative MR, while Ni–Cu samples exhibited strong negative MR (up to − 4.2 % at 10 kOe), confirming robust spin-polarized transport. These findings highlight how co-dopant chemistry dictates the balance between antiferromagnetic suppression and carrier-mediated enhancement of ferromagnetism in ZnS, offering valuable guidelines for designing room-temperature diluted magnetic semiconductors for spintronic applications.</p>}},
author = {{Patel, Prayas Chandra and Ghosh, Surajit and Upadhyay, Aditya Narayan}},
issn = {{0022-3697}},
keywords = {{Diluted-magnetic-semiconductors; Ferromagnetism; Magnetoresistance; Spintronics; Transition metal co-doping; ZnS nanoparticles}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Journal of Physics and Chemistry of Solids}},
title = {{Carrier-mediated ferromagnetism vs antiferromagnetic compensation in co-doped ZnS nanoparticles}},
url = {{http://dx.doi.org/10.1016/j.jpcs.2025.113373}},
doi = {{10.1016/j.jpcs.2025.113373}},
volume = {{210}},
year = {{2026}},
}