Single-crystalline HfO2 nanostructures with novel ferromagnetic properties

被引:3
作者
Beedel, Mahdi [1 ]
Rahman, Md Anisur [1 ]
Farkhondeh, Hanieh [1 ]
Thomas, Joseph Palathinkal [1 ]
Zhang, Lei [1 ]
Heinig, Nina F. [1 ]
Leung, Kam Tong [1 ]
机构
[1] Univ Waterloo, Dept Chem, 200 Univ Ave W, Waterloo, ON N2L 3G1, Canada
来源
MATERIALS TODAY NANO | 2024年 / 28卷
基金
加拿大自然科学与工程研究理事会;
关键词
Catalyst-assisted pulsed laser deposition; Oxygen vacancy induced ferromagnetism; Dopant-free dilute magnetic semiconducting; oxides; HfO2 single-crystalline nanostructures; HAFNIUM OXIDE NANOPARTICLES; ATOMIC LAYER DEPOSITION; SURFACE-TENSION; THIN-FILMS; RATIONAL CONCEPT; GROWTH; TEMPERATURE; REDUCTION; NANOWIRES; ALD;
D O I
10.1016/j.mtnano.2024.100510
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Hafnium oxide (HfO2) 2 ) has special technological significance due to its superior properties such as high dielectric constant (kappa-25), wide bandgap (-5.7 eV), and superb thermal and chemical stabilities. Its room-temperature ferromagnetism and excellent CMOS technology compatibility make it a promising candidate for seamless CMOS-spintronics integration. Low-dimensional single-crystalline HfO2 2 nanostructures, particularly one dimensional (1D) nanostructures, are expected to exhibit enhanced ferromagnetic properties due to large specific surface areas and potentially more surface defects. To date, the synthesis of single-crystalline HfO2 2 1D nano- structures has, however, remained elusive. Here, single-crystalline dopant-free HfO2 2 nanostructures with notable morphologies, including HfO2 2 1D nanostructures, are grown using catalyst-assisted pulsed laser deposition. It is shown that Sn plays a crucial role in producing these 1D nanostructures by increasing both the VLS nucleation and growth rates. Magnetization measurements reveal room-temperature ferromagnetism in HfO2 2 nanowires, contrasting with weak paramagnetic responses in HfO2 2 nanostructured films. We also provide the first direct evidence of oxygen vacancies as the source of room-temperature ferromagnetism in HfO2. 2 . To account for the observed magnetic property, we employ a modified bound magnetic polaron-band ferromagnetism hybrid model, which is also generally applicable to dopant-free nanostructures of other metal oxides. This work provides new insights into the growth of novel metal oxide 1D nanostructures and the design of new dilute magnetic semiconducting oxides for potential integrated CMOS-spintronics applications.
引用
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页数:13
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