Enhanced exchange bias and coercivity arising from heterojunctions in Ni-NiO nanocomposites

被引：37

作者：

Yao, Xiu-Juan ^{[1
,2
]}

He, Xue-Min ^{[1
,2
]}

Song, Xue-Yin ^{[1
,2
]}

Ding, Qian ^{[1
,2
]}

Li, Zhi-Wen ^{[1
,2
]}

Zhong, Wei ^{[1
,2
]}

Au, Chak-Tong ^{[3
]}

Du, You-Wei ^{[1
,2
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Jiangsu Prov Lab NanoTechnol, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

[3] Hong Kong Baptist Univ, Dept Chem, Hong Kong, Hong Kong, Peoples R China

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 15期

关键词：

MAGNETIC-PROPERTIES; SIZE; NANOPARTICLES; FIELD; DEPENDENCE; REDUCTION; PARTICLES; NICKEL; FE;

D O I：

10.1039/c3cp55316g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

By a reflux process, we prepared Ni-NiO nanocomposites that are face-centered cubic (fcc). By tuning the precursor concentration, we controlled the Ni content in the Ni-NiO nanocomposites. We found that both the interface of Ni and NiO crystal lattices and the weight fraction of Ni have significant impacts on their magnetic properties. There is increase of saturation magnetization and decrease of coercivity (H-C) with the increase of the Ni weight fraction. Large exchange bias (H-E) and enhanced H-C are observed at 5 K, which are due to the creation of heterojunctions at the interfaces of ferromagnetic Ni and antiferromagnetic NiO. After optimization, it is observed that the Ni-NiO nanocomposites with an Ni content of 2.6% show an H-C and H-E of 1068 and 350 Oe, respectively.

引用

页码：6925 / 6930

页数：6

共 39 条

[1] Magnetic and Structural Properties of Ni/NiO Nanoparticles Prepared Using Nickel Acetate and Polyvinyl Acetate Precursor [J].

Ahmadvand, Hossein ;

Salamati, Hadi ;

Kameli, Parviz ;

Razavi, Fereidoon S. .

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2010, 23 (08) :1467-1471

[2] Study of the magnetic microstructure of Ni/NiO nanogranular samples above the electric percolation threshold by magnetoresistance measurements [J].

Del Bianco, L. ;

Spizzo, F. ;

Tamisari, M. ;

Calbucci, M. ;

Allia, P. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2012, 24 (30)

[3] Coexistence of exchange bias effect and giant magnetoresistance in a Ni/NiO nanogranular sample [J].

Del Bianco, L. ;

Spizzo, F. ;

Tamisari, M. ;

Castiglioni, A. .

JOURNAL OF APPLIED PHYSICS, 2011, 110 (04)

[4] Dependence of exchange bias on the field-cooled remanent magnetic state in Ni/NiO nanogranular samples [J].

Del Bianco, L. ;

Spizzo, F. ;

Tamisari, M. ;

Laureti, S. .

SOLID STATE COMMUNICATIONS, 2011, 151 (05) :351-353

[5] Tailoring the exchange bias of Ni/NiO nanogranular samples by the structure control [J].

Del Bianco, L. ;

Spizzo, F. ;

Tamisari, M. .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2009, 321 (19) :3071-3076

[6] Exchange bias and interface structure in the Ni/NiO nanogranular system [J].

Del Bianco, L. ;

Boscherini, F. ;

Tamisari, M. ;

Spizzo, F. ;

Antisari, M. Vittori ;

Piscopiello, E. .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2008, 41 (13)

[7] Exchange bias and structural disorder in the nanogranular Ni/NiO system produced by ball milling and hydrogen reduction [J].

Del Bianco, L. ;

Boscherini, F. ;

Fiorini, A. L. ;

Tamisari, M. ;

Spizzo, F. ;

Antisari, M. Vittori ;

Piscopiello, E. .

PHYSICAL REVIEW B, 2008, 77 (09)

[8] Size Effects on Properties of NiO Nanoparticles Grown in Alkalisalts [J].

Duan, W. J. ;

Lu, S. H. ;

Wu, Z. L. ;

Wang, Y. S. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2012, 116 (49) :26043-26051

[9] Properties of highly crystalline NiO and Ni nanoparticles prepared by high-temperature oxidation and reduction [J].

Feygenson, Mikhail ;

Kou, Angela ;

Kreno, Lauren E. ;

Tiano, Amanda L. ;

Patete, Jonathan M. ;

Zhang, Fen ;

Kim, Moo Sung ;

Solovyov, Vyacheslav ;

Wong, Stanislaus S. ;

Aronson, Meigan C. .

PHYSICAL REVIEW B, 2010, 81 (01)

[10] Size dependence of the exchange bias field in NiO/Ni nanostructures [J].

Fraune, M ;

Rüdiger, U ;

Güntherodt, G ;

Cardoso, S ;

Freitas, P .

APPLIED PHYSICS LETTERS, 2000, 77 (23) :3815-3817

← 1 2 3 4 →