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

doi:10.1039/c5ra20290f

HFCAS OpenIR > 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
	2015
发表期刊	RSC ADVANCES
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.
文章类型	Article
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1039/c5ra20290f
关键词[WOS]	ANTIPEROVSKITE MANGANESE NITRIDE ; NEGATIVE THERMAL-EXPANSION ; MAGNETIC-PROPERTIES ; EXCHANGE BIAS ; TEMPERATURE ; LATTICE ; SIZE ; MNO
收录类别	SCI
语种	英语
项目资助者	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)
WOS研究方向	Chemistry
WOS类目	Chemistry, Multidisciplinary
WOS记录号	WOS:000366965200090
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/30222
专题	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.

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