# Henri J. Jansen

# Henri J. Jansen

## Research

The research performed by Dr. Jansen is best characterized as computational solid state physics. The calculations in his group focus on the electronic structure of solids and the electronic contribution to the total energy of solids. This work relies on very precise numerical techniques for simple solids with a small number of atoms in the unit cell, but also semi-empirical techniques for large systems including defects of surfaces. The numerical results are used for studies of structural properties and magnetic properties of solids. These total energy calculations can also yield predictions for phonon spectra. A parametrized form of the total energy is an essential part of the molecular dynamics calculations which are performed to explore the behavior of solids at higher temperatures. Most of the initial program development and computing is done on local workstations. Not all work is computer related, however, and part of the research pertains to details of the basic theory describing the interacting electrons in a solid.

## Background

### Education

Ph.D. research studies at the Institute of Solid State Physics in Groningen under the supervision of Prof. F. M. Mueller (University of Nijmegen) and Prof. F. van der Woude (University of Groningen)

### Publications

- G. Schneider and H.J.F. Jansen, "Role of Orbital Polarization in Calculations of the Magnetic Anisotropy," Journ. of Appl. Physics 87 5875-5877 (2000)
- S. Fox and H.J.F. Jansen, "Total energy of trigonal and tetragonal cobalt," Phys. Rev. B. 60, 4397-4400 (1999).
- H.J.F. Jansen, "Magnetic anisotropy in density functional theory," Phys. Rev. B 59, 4699-4707 (1999).
- S. Erkoc and H.J.F. Jansen, "Application of density functional theory to atomic resonances," Phys. Rev. A 59, 2490-2493 (1999).
- R. H. Landau and M. J. Paez Mejia, "Computational Physics: Problem Solving with Computers," contributors H.J.F. Jansen and H. Kowallik, John Wiley and Sons, Inc, New York (1997).
- G. Schneider, R.P. Erickson, and H.J.F. Jansen, "Calculation of the magnetocrystalline anisotropy energy using a torque method," Journ. of Appl. Physics 81, 3869-3871 (1997).
- H.J.F. Jansen, "Fixed spin moment calculations of the total energy of Fe16N2," Journ. of Appl. Physics 81, 3866-3868 (1997).
- S. Fox and H.J.F. Jansen, "Structural and magnetic properties of trigonal iron," Phys. Rev.B 53, 5119-5122 (1996).
- H.J.F. Jansen, "Electronic structure calculations for magnetically ordered systems," Physics Today 48-4, 50-55 (1995).
- D.M. Sherman and H.J.F. Jansen, "First principles prediction of The high pressure phase transition and electronic structure of FeO," Geophys. Res. Lett. 22, 1001-1004 (1995).

## Awards

- May 1988: Phi Kappa Phi, Emerging Scholar Award, Oregon State University.