Magnetism in nanocrystalline SiC films

Семенов, А. А.; Pashchenko, V. A.; Khirnyi, V. F.; Kozlovskyi, A. A.; Mateichenko, P. V.

doi:10.1016/j.physe.2015.07.006

Cited by 2 publications

(2 citation statements)

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“…Such a co-existence of different magnetic phases including paramagnetic, superparamagnetic and ferromagnetic components has been also identified in nano-crystalline SiC with defects [66], in reduced graphene oxide [74] and in irradiated graphite [75,76].…”

Section: Magnetic Phases In Ion-irradiated Sicmentioning

confidence: 76%

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Defect-induced magnetism in SiC

Zhou

Chen

2019

J. Phys. D: Appl. Phys.

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Defect induced magnetism, which can be controllably generated by ion or neutron irradiation, is attracting intensive research interest. It not only challenges the traditional opinions about magnetism, but also has some potential applications in spin-electronics. SiC is a new candidate for the investigation of defect-induced ferromagnetism after graphitic materials and oxides due to its high material purity and crystalline quality [1, 2]. In this contribution, we made a comprehensive investigation on the structural and magnetic properties of ion implanted and neutron irradiated SiC samples. In combination with X-ray absorption spectroscopy, high-resolution transmission electron microscopy and first-principles calculations, we try to understand the mechanism in a microscopic picture. For neon or xenon ion implanted SiC, we identify a multi-magnetic-phase nature [3]. The magnetization of SiC can be decomposed into paramagnetic, superparamagnetic and ferromagnetic contributions. The ferromagnetic contribution persists well above room temperature and exhibits a pronounced magnetic anisotropy. By combining X-ray magnetic circular dichroism and first-principles calculations, we clarify that p-electrons of the nearest-neighbor carbon atoms around divacancies are mainly responsible for the long-range ferromagnetic coupling [4]. Thus, we provide a correlation between the collective magnetic phenomena and the specific electrons/orbitals. With the aim to verify if a sample containing defects through its bulk volume can persist ferromagnetic coupling, we applied neutron irradiation to introduce defects into SiC [5]. Besides a weak ferromagnetic contribution, we observe a strong paramagnetism, scaling up with the neutron fluence. The ferromagnetic contribution only occurs in a narrow fluence window or after annealing. First-principles calculations hint towards a mutually exclusive role of the concentration of defects: Defects favor spin polarization at the expense of magnetic interaction. Although both Raman scattering and X-ray diffraction reveal essential structure damage to SiC due to irradiation, high-resolution transmission electron microscopy does not detect significant structural variation even upon the largest neutron fluence.

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Section: Magnetic Phases In Ion-irradiated Sicmentioning

confidence: 76%

“…The paramagnetism in defective SiC was also revealed in nanocrystalline SiC [66]. The magnetization of the films is correlated with the deposition temperature.…”

Section: Paramagnetismmentioning

confidence: 89%

Defect-induced magnetism in SiC

Zhou

Chen

2019

J. Phys. D: Appl. Phys.

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Effect of electron irradiation on the optical properties of nanocrystalline SiC films on single crystal Al2O3 substrates

2017

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Одíèм èз ïåðâîîчåðåдíыõ òðåбîâàíèé ê ïåð-ñïåêòèâíым ýëåêòðîííым ïðèбîðàм ÿâëÿåòñÿ ïî-âышåíèå èõ ñòîéêîñòè ê èíòåíñèâíым ðàдèàцè-îííым âîздåéñòâèÿм. В ñâÿзè ñ ýòèм, âíèмàíèå ðàзðàбîòчèêîâ îбðàщåíî ê íàíîêðèñòàëëèчåñêèм ïîëóïðîâîдíèêîâым мàòåðèàëàм, îбëàдàющèм èñêëючèòåëьíî âыñîêèмè ïîðîãàмè ðàдèàцèîí-íыõ дåãðàдàцèè è àмîðфèзàцèè ïî ñðàâíåíèю ñ мîíîêðèñòàëëàмè [1][2][3]. Эòî îбóñëîâëåíî âы-ñîêîé êîíцåíòðàцèåé èíòåðфåéñíыõ îбëàñòåé â âèдå ãðàíèц íàíîêðèñòàëëîâ, êîòîðыå мîãóò âы-ñòóïàòь â êàчåñòâå ïîãëîòèòåëåé òîчåчíыõ дåфåê-òîâ è îбåñïåчèâàòь óñêîðåíèå èõ ðåêîмбèíàцèè [4, 5]. Мàòåðèàëы íà îñíîâå íàíîêðèñòàëëèчå-ñêîãî êàðбèдà êðåмíèÿ nc-SiC ïðèâëåêàюò îñî-бîå âíèмàíèå â ñâÿзè ñ êîмïëåêñîм óíèêàëьíыõ ñâîéñòâ SiC, òàêèõ êàê âыñîêèå зíàчåíèÿ ïîðî-ãîâîé ýíåðãèè дåфåêòîîбðàзîâàíèè (25-35 ýВ) [6, 7], âыñîêîòåмïåðàòóðíàÿ ñòàбèëьíîñòь, õè-мèчåñêàÿ èíåðòíîñòь è îòëèчíыå мåõàíèчåñêèå ñâîéñòâà [8,9]. Êðîмå фóíдàмåíòàëьíыõ ñâîéñòâ ñëîè nc-SiC, ïîëóчåííыå ïðÿмым èîííым îñàж-дåíèåм [10], îбëàдàюò ðÿдîм ñâîéñòâ, ñâÿзàí-íыõ ñ òàêèмè êâàíòîâымè ýффåêòàмè â íàíî-êðèñòàëëàõ, êàê àíîмàëьíî âыñîêàÿ íåëèíåé-íî îïòèчåñêàÿ âîñïðèèмчèâîñòь [11, 12] íèêè, êâàíòîâîé ýëåêòðîíèêè â óñëîâèÿõ âíåш-íèõ жåñòêèõ âîздåéñòâèé.Иññëåдîâàíèÿ âëèÿíèÿ îбëóчåíèÿ ïëåíîê nc-SiC âыñîêîýíåðãåòèчåñêèмè (10 МýВ) ýëåê-òðîíàмè, âыïîëíåííыå ðàíåå â [15], ïîêàзàëè âыñîêóю ðàдèàцèîííóю ñòîéêîñòь мàòåðèàëà è íåмîíîòîííóю зàâèñèмîñòь ñâîéñòâ îò фëюåíñà îбëóчåíèÿ. Пðè ýòîм быëî óñòàíîâëåíî, чòî бî-ëåå ñëàбым зâåíîм â ðàдèàцèîííîé ñòàбèëьíî-ñòè îïòèчåñêèõ ñâîéñòâ ñèñòåмы «nc-SiC-ïëåíêà + ïîдëîжêà Al 2 O 3 » ÿâëÿåòñÿ ïîдëîжêà: íåñмî-òðÿ íà òî, чòî мîíîêðèñòàëë Al 2 O 3 ÿâëÿåòñÿ îд-íèм èз íàèбîëåå ðàдèàцèîííî ñòîéêèõ êðèñòàë-ëèчåñêèõ мàòåðèàëîâ, ñàïфèðîâàÿ ïîдëîжêà ïðîÿâèëà бîëåå âыñîêóю зàâèñèмîñòь èзмåíåíèÿ îïòèчåñêîé ïëîòíîñòè îò фëюåíñà îбëóчåíèÿ ïî ñðàâíåíèю ñ nc-SiC ïëåíêàмè. Пîýòîмó â íàñòî-ÿщåé ðàбîòå бîëåå дåòàëьíî èññëåдîâàíî âëèÿ-íèå âыñîêîýíåðãåòèчåñêîãî (10 МýВ) ýëåêòðîí-íîãî îбëóчåíèÿ è âîññòàíàâëèâàющåãî îòжèãà íà îïòèчåñêèå ñâîéñòâà ñèñòåмы, ñîñòîÿщåé èз ïëåíêè nc-SiC ïðîèзâîëьíîãî ðîмбîýдðèчåñêî-ãî ïîëèòèïà è ïîдëîжêè Al 2 O 3 .Экспериментальные образцы и методика измерений Пðîâîдèëîñь îбëóчåíèå ýëåêòðîíàмè ñ ýíåð-ãèåé 10 МýВ íàíîêðèñòàëëèчåñêèõ ïëåíîê êàð-бèдà êðåмíèÿ òîëщèíîé 1,2 мêм, îñàждåííыõ íà ïîдëîжêè èз ñàïфèðà мåòîдîм ïðÿмîãî èîííî-ãî îñàждåíèÿ [10]. В èññëåдóåмыõ ïëåíêàõ ñî-

show abstract

Magnetism in nanocrystalline SiC films

Cited by 2 publications

References 29 publications

Defect-induced magnetism in SiC

Defect-induced magnetism in SiC

Effect of electron irradiation on the optical properties of nanocrystalline SiC films on single crystal Al2O3 substrates

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