Magnetic Properties for Magnetic Quantum Dot Arrays: Fast Fourier Transformation and Micromagnetism Study

Abstract:

Based on the Monte-Carlo simulation and fast Fourier transformation-micro-magnetism (FFTM) method, magnetic properties with different parameters for the 4×4 Magnetic Quantum Dot Arrays (QDA) were studied. The calculating processes show that the same calculated results can be obtained by both methods above. But the FFTM method can save much time in obtaining results, which suggest that the method be employed to study more complex systems. The calculated results indicate that there exists obvious difference in the magnetic hysteresis loops with different temperatures, which can be well explained by considering the relationship between the easy-magnetization axis and the organization anisotropy of the QDA system. Furthermore, saturation field (Hs) increases with the dipolar interaction increasing, which is attributed to the competition between dipolar energy (E_D) and Zeeman energy (E_Z). The calculated results can fit the experimental results very well. Besides, it is found that the dipolar interaction constant D has a great influence on magnetic properties.

• Periodical: Materials Science Forum (Volume 749)
• Pages: 432-436
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.749.432
• Online since: March 2013
• Authors: Qing Ying Ye, Shui Yuan Chen, Ke Hua Zhong, Xiu Lai Chen, Zhi Gao Huang
• Keywords: Fast Fourier Transformation, Magnetic Property, Micromagnetism, Monte-Carlo Simulation, Quantum Dot (QD)

References

[1] R.C. Ashoori, Electrons in artificial atoms, Nature. 379(1996) 413-419.

[2] P.L. McEuen, Artificial Atoms: New Boxes for Electrons, Science. 278(1997)1729-1730.

DOI: 10.1126/science.278.5344.1729

[3] L.E. Helseth, Colloidal Printer Based on an Optical Micropump, Appl. Phys. Lett. 90 (2007) 093501-093504.

DOI: 10.1063/1.2710187

[4] A. Imre, G. Csaba, L. Ji et al., Majority logic gate for magnetic quantum-dot cellular automata, Science. 311(2006)205-208.

DOI: 10.1126/science.1120506

[5] Dana A. Schwartz, Nick S. Norberg, Quyen P. Nguyen et al., Magnetic Quantum Dots: Synthesis, Spectroscopy and Magnetism of Co2+ and Ni2+ Doped ZnO Nanocrystals, J. Am. Chem. Soc. 125(2003)13205-13218.

DOI: 10.1021/ja036811v

[6] Q.Y. Ye, Q. Feng, et. al., Study of Magnetic Dynamic Properties for Magnetic Cluster and Quantum Dots with Hexagonal Array, J. Nanosci. Nanotechno. 9(2009)1635-1639.

DOI: 10.1166/jnn.2009.c220

[7] E.N. Bogachek, A. G. Scherbakov, Uzi Landman, Temperature scales of magnetization oscillation in an asymmectric quantum dot, Phys. Rev. B. 63(2001)115323-1-115323-7.

DOI: 10.1103/physrevb.63.115323

[8] L. Malkinski, R. E. Camley, Z. Celinski et al., Hexagonal lattice of 10-nm magnetic dots, J. Appl. Phys. 93(2002) 7325-7327.

DOI: 10.1063/1.1543861

[9] Z.G. Huang, Z.G. Chen, F.M. Zhang et al., Magnetization and configurational anisotropy in magnetic clusters: Monte Carlo simulation, Eur. Phys. J. B. 37(2004)177-185.

[10] Z. Huang, Z. Chen, S. Li et al., Effects of size and surface anisotropy on thermal magnetization and hysteresis in the magnetic clusters, Eur. Phys. J. B. 51( 2006) 65-76.

DOI: 10.1140/epjb/e2006-00188-7

[11] K.H. Zhong, Q. Feng, Z.Z. Weng et. al., A Fast Fourier Transformation Micromagnetism Method, Chn. J. Comp. Phy. 22(2005) 534-538.

[12] L. Malkinski, R.E. Camley, Z. Celinski et al., Hexagonal lattice of 10-nm magnetic dots, J. Appl. Phys. 93( 2002)7325-7327.

DOI: 10.1063/1.1543861