Strong ferromagnetism beyond the mechanism of uncompensated surface spins in nanocrystalline GaCMn3

doi:10.1039/c5ra20290f

CORC > 合肥物质科学研究院 > 中国科学院合肥物质科学研究院 > 中科院固体物理研究所

	Strong ferromagnetism beyond the mechanism of uncompensated surface spins in nanocrystalline GaCMn3
	Song, B.1,2; Lin, J. C.1; Tong, P.1; Wang, M.1; Yang, C.1; Guo, X. G.1; Lin, S.1; Sun, Y. P.1,3,4
刊名	RSC ADVANCES
	2015
卷号	5 期号:128 页码:106213-106218
DOI	10.1039/c5ra20290f
文献子类	Article
英文摘要	Weak ferromagnetism arising from uncompensated surface spins (USS) is usually expected when an antiferromagnetic (AFM) material is diminished to nanoscale in size. Here we report strong ferromagnetism beyond the USS-mechanism in the AFM ground state of nanocrystalline GaCMn3. The enhanced ferromagnetism can be attributed to an AFM to ferromagnetic (FM) transformation in the shell with a finite thickness of a crystallite. As the average crystallite size (< D >) decreases, the FM shell expands relative to the AFM core, leading to strengthening ferromagnetism. Through the AFM/FM interface the rotation of FM spins under a magnetic field is impeded by the AFM spins, leading to a large coercivity (H-C). The largest H-C (similar to 6.4 kOe at 5 K) was observed in the sample with a critical < D > of similar to 15 nm. In contrast, USS-type weak ferromagnetism was observed in nanocrystalline GaNMn3. Our results suggest a new approach to achieving strong FM order beyond the prediction of the USS mechanism, as well as to designing AFM-core/FM-shell nanostructures based on nanosized AFM materials.
WOS关键词	ANTIPEROVSKITE MANGANESE NITRIDE ; NEGATIVE THERMAL-EXPANSION ; MAGNETIC-PROPERTIES ; EXCHANGE BIAS ; TEMPERATURE ; LATTICE ; SIZE ; MNO
WOS研究方向	Chemistry
语种	英语
WOS记录号	WOS:000366965200090
资助机构	National Key Basic Research(2011CBA00111) ; National Key Basic Research(2011CBA00111) ; National Key Basic Research(2011CBA00111) ; National Key Basic Research(2011CBA00111) ; National Natural Science Foundation of China(51322105 ; National Natural Science Foundation of China(51322105 ; National Natural Science Foundation of China(51322105 ; National Natural Science Foundation of China(51322105 ; 11174295 ; 11174295 ; 11174295 ; 11174295 ; 51301167 ; 51301167 ; 51301167 ; 51301167 ; 51171177 ; 51171177 ; 51171177 ; 51171177 ; 91222109) ; 91222109) ; 91222109) ; 91222109) ; National Key Basic Research(2011CBA00111) ; National Key Basic Research(2011CBA00111) ; National Key Basic Research(2011CBA00111) ; National Key Basic Research(2011CBA00111) ; National Natural Science Foundation of China(51322105 ; National Natural Science Foundation of China(51322105 ; National Natural Science Foundation of China(51322105 ; National Natural Science Foundation of China(51322105 ; 11174295 ; 11174295 ; 11174295 ; 11174295 ; 51301167 ; 51301167 ; 51301167 ; 51301167 ; 51171177 ; 51171177 ; 51171177 ; 51171177 ; 91222109) ; 91222109) ; 91222109) ; 91222109)
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/30222]
专题	合肥物质科学研究院_中科院固体物理研究所
作者单位	1.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China 2.Anhui Univ, Sch Phys & Mat Sci, Hefei 230601, Peoples R China 3.Chinese Acad Sci, High Magnet Field Lab, Hefei 230031, Peoples R China 4.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Song, B.,Lin, J. C.,Tong, P.,et al. Strong ferromagnetism beyond the mechanism of uncompensated surface spins in nanocrystalline GaCMn3[J]. RSC ADVANCES,2015,5(128):106213-106218.
APA	Song, B..,Lin, J. C..,Tong, P..,Wang, M..,Yang, C..,...&Sun, Y. P..(2015).Strong ferromagnetism beyond the mechanism of uncompensated surface spins in nanocrystalline GaCMn3.RSC ADVANCES,5(128),106213-106218.
MLA	Song, B.,et al."Strong ferromagnetism beyond the mechanism of uncompensated surface spins in nanocrystalline GaCMn3".RSC ADVANCES 5.128(2015):106213-106218.