Recent Publications:

 

Z. Lu, P.B. Visscher, and J.W. Harrell, "Anisotropy-graded media: magnetic characterization," J. Appl. Phys. 103, 07F507 (2008).

 

S. Kang, S. Shi, D.E. Nikles, and J.W. Harrell, “Easy control of the size and composition of FePt nanoparticles with improved synthesis,” J. Appl. Phys. 103, 07D503  (2008).

 

M. Shamsuzzoha, Z. Jia, D. E. Nikles and J. W. Harrell “Synthesis, L10 ordering and magnetic properties of Fe50Pt35Rh15 nanoparticles” Proceedings of the Metals, Minerals and Materials Society, 2007 Nanometals: Fabrication, Properties and Applications; Edited by W. Choi, A. Tiwari and S. Kang, pp. 45-53.

D. Suess, S. Eder, J. Lee, R. Dittrich, J. Fidler, J.W. Harrell, T. Schrefl, G. Hrkac, M. Schabes, N.Supper, and A. Berger, “Reliability of Sharrock’s equation for exchange spring bilayers,” Phys. Rev. B 75, 174430 (2007).

Shishou Kang, Shifan Shi, Zhiyong Jia, G. B. Thompson, David E. Nikles, and J. W. Harrell, "Microstructures and magnetic alignment of L10 FePt nanoparticles," Journal of Applied Physics 101, 09J113 (2007).

 

Shishou Kang, Shifan Shi, G. X. Miao, Zhiyong Jia, David E. Nikles, and J. W. Harrell , “Synthesis and Magnetic Properties of FePt Nanoparticles with Hard Nonmagnetic Shells,” J. Nanosci. Nanotechnol. 7, 350-355 (2007).

 

C. Scott Brown, J.W. Harrell, and S. Matsunuma, “Time and temperature dependence of the magnetization reversal in a Co/Pd multilayer film,” J. Appl. Phys. 100, 053910 (2006).

 

C. Verdes, R.W. Chantrell, A. Satoh, J.W. Harrell, and D. Nikles, “Self-organisation, orientation and magnetic properties of FePt nanoparticle arrays,“ J. Magn. Magn. Mater. 304, 27 (2006).

 

Shifan Shi, Shishou Kang, Zhiyong Jia, David E. Nikles, J.W. Harrell and M. Shamsuzzoha, “Effect of Sintered Grain Growth on Chemical Ordering in Binary FePt/Cu Nanoparticle Arrays,” Journal of Nanoscience and Nanotechnology, 6, 2147 (2006).

 

C. Srivastava, G.B. Thompson, J.W. Harrell, and D.E. Nikles, “Size Effect Ordering in FePt100-xCrx Nanoparticles,” J. Appl. Phys. 99,054304 (2006).

 

Shishou Kang, G.X. Miao, S. Shi, Z. Jia, David E. Nikles, and J.W. Harrell, “Enhanced Magnetic Properties of Self-Assembled FePt Nanoparticles with MnO Shell,” J. Am. Chem. Soc. 128, 1042 (2006).

 

Shishou Kang, Zhiyong Jia, I. Zoto, D. Reed, David E. Nikles, J. W. Harrell, Gregory Thompson, and Gary Mankey, “Sintering Behavior of Spin-coated FePt and FePtAu Nanoparticles,” J. Appl. Phys. 99, 08N704 (2006).

 

Zhiyong Jia, Shishou Kang, Shifan Shi, David E. Nikles, J. W. Harrell, and M. Shamsuzzoha, “Improved Synthesis and Easy Axis Alignment of L10-FePt Nanoparticles,” J. Appl. Phys. 99, 08E904 (2006).

 

J.W. Harrell, S. Kang, Z. Jia, D.E. Nikles, R. Chantrell, A. Satoh, “A Model for the Easy-Axis Alignment of Chemically Synthesized L10 FePt Nanoparticles,” Appl. Phys. Lett. 87, 202508 (2005).

 

Zhiyong Jia, Shishou Kang, D.E. Nikles, and J.W. Harrell, “Synthesis of FePtAu Nanoparticles in High-boiling-point Solvents,” IEEE Trans. Mag. 41, 3385 (2005).

 

Naidu V. Seetala, J. W. Harrell, Jeremy Lawson, David E Nikles, John R. Williams, Tamara Isaacs-Smith, “Ion-irradiation Induced Chemical Ordering of FePt and FePtAu Nanoparticles,” Nuclear Instruments and Methods B 241, 583 (2005).

 

Shishou Kang, Zhiyong Jia, Shifan Shi, David E. Nikles, and J. W. Harrell, “Easy Axis Alignment of Partially Ordered FePt Nanoparticles,” Appl. Phys. Lett. 86, 062503 (2005).

 

J.W. Harrell, D.E. Nikles, S.S. Kang, X.C. Sun, Z. Jia, S. Shi, J. Lawson, Gregory B. Thompson, Chandan Srivastava, and Naidu V. Seetala, “Effect of Metal Additives on L10 Ordering of Chemically Synthesized FePt Nanoparticles,” Scripta Materialia 53, 411 (2005).

 

Xiangcheng Sun, C. J. Thode, J. K. Mabry, J. W. Harrell, D. E. Nikles, K. Sun, and L. M. Wang, “Self-assembly of magnetic biofunctional nanoparticles,” J. Appl. Phys. 97, 10Q901 (2005).

 

Shishou Kang, Zhiyong Jia, Shifan Shi, David E. Nikles, and J. W. Harrell, "Direct Synthesis and Easy Axis Alignment of L10 -FePt Nanoparticles," J. Appl. Phys. 97, 10J318 (2005).

 

Zhiyong Jia, Shishou Kang, Shifan Shi, David E. Nikles, and J. W. Harrell, “Size Effect on L10 Ordering and Magnetic Properties of Chemically Synthesized FePt and FePtAu Nanoparticles,” J. Appl. Phys. 97, 10J310 (2005).

 

A. Butera, S.S. Kang, D.E. Nikles, and J.W. Harrell, “Self-assembled Arrays of High-Anisotropy FePt-Au Nanoparticles,” Physica B 354, 108 (2004).

 

J.W. Harrell, D.E. Nikles, S.S. Kang, X.C. Sun, and Z. Jia, “Effect of Addtiive Cu, Ag, and Au on L10 Ordering of Chemically Synthesized FePt Nanoparticles,” Journal of the Magnetic Society of Japan 28, 847 (2004).

 

S. Kang, Z. Jia, D.E. Nikles and J.W. Harrell, “Synthesis and Phase Transition of Self-Assembled FePd and FePdPt Nanoparticles,” J. Appl. Phys. 95, 6744 (2004).

 

D. E. Nikles and J. W. Harrell  “Magnetic Nanoparticles: Applications for Granular Recording Media,” in Encyclopedia of Nanoscience and Nanotechnology, James A. Schwarz, Cristian Contescu and Karol Putyera, Eds., Marcel Dekker, pp. 1701-1713 (2004). 

 

Xiangcheng Sun, Z.Y. Jia, Y.H. Huang, J. W. Harrell, D. E. Nikles, K. Sun and L. M. Wang “Synthesis and Magnetic Properties of CoPt Nanoparticles,” J. Appl. Phys. 95, 6747 (2004).

 

S. Wang, S.S. Kang, J.W. Harrell, X.W. Wu, and R.W. Chantrell, “Coercivity ratio and anisotropy distribution in chemically-synthesized L10 FePt nanoparticle systems,” Phys. Rev. B. 68, 104413 (2003).

 

S.S. Kang, Z. Jia, D.E. Nikles, and J.W. Harrell, “Synthesis, chemical ordering and magnetic properties of [FePt]1-xAux nanoparticles,” IEEE Trans. Magn. 39, 2753 (2003).

M. Chen, D.E. Nikles, S. Wang, J.W. Harrell, H. Yin, Y. Ding, and S.A. Majetich, “Patterning Self-Assembled FePt Nanoparticles,” J. Magn. Magn. Mater. 266, 8 (2003).

 

S. Wang, S.S. Kang, D.E. Nikles, J.W. Harrell and X.W. Wu, “Magnetic properties of self-organized L10 FePtAg nanoparticle arrays,” J. Magn. Magn. Mater. 266, 49 (2003).

S.S. Kang, D.E. Nikles and J.W. Harrell, “Synthesis, chemical ordering and magnetic properties of FePt-Ag nanoparticles,” J. Appl. Phys. 93, 7178 (2003).

X. Sun, S. Kang, J.W. Harrell, and D.E. Nikles, “Synthesis, chemical ordering and magnetic properties of FePtCu nanoparticle films,” J. Appl. Phys. 93, 7337 (2003).

R. Schad, H. Alouach, J.W. Harrell, M. Shamsuzzoha, and D. Wang, “Superparamagnetic NiFeCo layers as free layers in magnetic tunnel junctions,” J. Appl. Phys. 93, 8561 (2003).

 

Xiangcheng Sun, S. S. Kang, J. W. Harrell, and David E. Nikles, “Synthesis, Self-assembly and magnetic Properties of FePtCu Nanoparticle Arrays,” Materials Research Society Proceedings vol. 739, p. H7.40.1 (2002).

 

S. Wang, T. Zhao, and J.W. Harrell, “Zero field viscosity in perpendicular media,” IEEE Trans. Magn. 38, 2000 (2002).

S. Kang, D. E. Nikles and J. W. Harrell  “Reduction of Ordering Temperature of Self-Assembled FePt Nanoparticles by the Addition of Ag,” Nano Letters 2, 1033 (2002).

S. Brown, J.W. Harrell, H. Fujiwara, and T. Takeuchi, “Temperature dependence of magnetization reversal in TbFeCo films,” J. Appl. Phys. 91, 8243 (2002).

J.W. Harrell, S. Wang, and H. Fujiwara, “Field step dependence of delta-M curves,” J. Appl. Phys. 91, 8605 (2002).

S. Wang and J.W. Harrell, “Magnetic properties of ordered CoPt/SiO2 multilayer films,” Journal of Magnetism and Magnetic Materials, 242-245, 437 (2002).

J.W. Harrell, S. Wang, D.E. Nikles, and M. Chen, “Thermal effects in self-assembled FePt nanoparticles with partial chemical ordering,” Appl. Phys. Lett. 79, 4393 (2001).

H. Rubio, S. Suarez, S. Brown, and J.W. Harrell, "Anisotropy axes distribution and interactions in Nanomagnet Systems," Phys. Rev. B 64, 094430 (2001).

J. Du, S. Wang, C. Ruby, A. Khapikov, W.J. Liu, J.A. Barnard, and J.W. Harrell, "Magnetic and structural properties of annealed CoPt/C multilayers," J. Magn. Magn. Mater. 231, 231 (2001).

S. Wang, A.F. Khapikov, S. Brown, and J.W. Harrell, "Thermal effects on delta-M measurements in magnetic thin films," IEEE Trans. Magn. 37, 1518 (2001).

S. Wang, A.F. Khapikov, and J.W. Harrell, "Zero field viscosity in magnetic thin films and tapes," IEEE Trans. Magn. 37, 1540 (2001).

A.F. Khapikov, S. Wang, B. Xu, and J.W. Harrell, "Zero field relaxation and exchange interactions in magnetic thin films," Phys. Rev. B, 63, 20401 (2001).

J.W. Harrell, "Orientation dependence of the dynamic coercivity of Stoner-Wohlfarth particles," IEEE Trans. Magn. 37, 533 (2001).

J. Du, S. Wang, J.N. Zhou, J.W. Harrell, and J.A. Barnard, "Microstructural and magnetic characterization of Co/CN films fabricated by nanolamination," J. Magn. Magn. Mater. 219, 78 (2000).

T. Zhao, C. Hou, H. Fujiwara, H. Cho, J.W. Harrell, and A.F. Khapikov, "Study of 360o domain walls in exchange biased NiFe/NiO films by tip-sample interaction with a magnetic force microscope," J. Appl. Phys. 87, 6484 (2000).

A.F. Khapikov, J.W. Harrell, H. Fujiwara, and C. Hou, "Temperature dependence of exchange field and coercivity in polycrystalline NiO/NiFe film with thin antiferromagnetic layer: Role of antiferromagnetic grain size distribution," J. Appl. Phys. 87, 4954 (2000). 

J.N. Zhou, J. Du, A.F. Khapikov, S. Wang, J.A. Barnard, J.W. Harrell, and W.D. Doyle, "Structure and magnetic properties of multilayer Co/CN granular films," J. Appl. Phys. 87, 5624 (2000). 

J.W. Harrell and A.F. Khapikov, "Temperature dependence of magnetic viscosity and irreversible susceptibility for aligned Stoner-Wohlfarth particles," J. Appl. Phys. 87, 5708 (2000). 

S.M. Stinnett, J.W. Harrell, A.F. Khapikov, and W.D. Doyle, "The Relationship between the Dynamic Remanent Coercivity and the Viscosity and Irreversible Susceptibility in Magnetic Media," IEEE Trans. Magn. 36, 148 (2000).

J.W. Harrell, "Effect of AC Gradient Field on Magnetic Measurements with an Alternating Gradient Magnetometer," J. Magn. Magn. Mater. 205, 121 (1999).