Weak Electron Irradiation Suppresses the Anomalous Magnetization of N‐Doped Diamond Crystals

Setzer, A.; Esquinazi, P.; Daikos, Olesya; Scherzer, Tom; Pöppl, Andreas; Staacke, Robert; Lühmann, Tobias; Pezzagna, Sébastien; Knolle, Wolfgang; Буга, С. Г.; Abel, Bernd; Meijer, Jan

doi:10.1002/pssb.202100395

Cited by 4 publications

(2 citation statements)

References 62 publications

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“…In Figure 5 a,b and due to the fact that these centers were distributed all over the samples, the shown magnetization values were obtained taking into account the whole sample mass. On the other hand, we note that N-related C centers were at the origin of the clear hysteretic behavior in field and temperature observed below 50 K [ 29 , 30 ].…”

Section: Resultsmentioning

confidence: 99%

Nanometers-Thick Ferromagnetic Surface Produced by Laser Cutting of Diamond

Setzer¹,

Esquinazi²,

Буга

et al. 2022

Materials

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In this work, we demonstrate that cutting diamond crystals with a laser (532 nm wavelength, 0.5 mJ energy, 200 ns pulse duration at 15 kHz) produced a ≲20 nm thick surface layer with magnetic order at room temperature. We measured the magnetic moment of five natural and six CVD diamond crystals of different sizes, nitrogen contents and surface orientations with a SQUID magnetometer. A robust ferromagnetic response at 300 K was observed only for crystals that were cut with the laser along the (100) surface orientation. The magnetic signals were much weaker for the (110) and negligible for the (111) orientations. We attribute the magnetic order to the disordered graphite layer produced by the laser at the diamond surface. The ferromagnetic signal vanished after chemical etching or after moderate temperature annealing. The obtained results indicate that laser treatment of diamond may pave the way to create ferromagnetic spots at its surface.

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Section: Resultsmentioning

confidence: 99%

Nanometers-Thick Ferromagnetic Surface Produced by Laser Cutting of Diamond

Setzer¹,

Esquinazi²,

Буга

et al. 2022

Materials

Self Cite

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show abstract

“…176the origin for the clear hysteretic behavior in field and temperature observed below 50 K 177[22,23]. As we show below, the magnetic behavior of the untreated natural diamond 178 crystals (or of the CVD samples) can be recovered after removing the graphitic-like film 179 produced by the laser treatment.…”

mentioning

confidence: 94%

Nanometers-Thick Ferromagnetic Surface Produced by Laser Cutting of Diamond

Setzer¹,

Esquinazi²,

Буга³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

In this work, we demonstrate that cutting diamond crystals with a laser (532 nm wavelength, 0.5 mJ energy, 200 ns pulse duration at 15 kHz) produces a ≲20nm thick surface layer with magnetic order at room temperature. We have measured the magnetic moment with a SQUID magnetometer of six natural and six CVD diamond crystals of different size, nitrogen content and surface orientations. A robust ferromagnetic response at 300 K is observed only for crystals that were cut with the laser along the (100) surface orientation. The magnetic signals are much weaker for the (110) and negligible for the (111) orientations. We attribute the magnetic order to the disordered graphite layer produced by the laser at the diamond surface. The ferromagnetic signal vanished after chemical etching or after moderate temperature annealing. The obtained results indicate that laser treatment of diamond may pave the way to create ferromagnetic spots at its surface.

show abstract