# Non-Collinear Magnetism in Permalloy

## Abstract

Permalloy is an important material in a wide variety of magnetic systems, most notably in GMR read-heads. However, despite this great interest its properties are not fully understood. For an in depth analysis of important physical properties as e.g. electric transport or magnetic anisotropy a detailed understanding of the distribution of magnetic moments on an atomic level is necessary. Using our first principles Locally Self-consistent Multiple Scattering (LSMS) method we calculate the magnetic ground state structure for a large super-cell model of Permalloy. Our code allows us to solve both the usual non-relativistic Schrdinger equation as well as the fully relativistic Dirac equation and to find the magnitude and direction of the magnetic moments at each atomic site. While the non-relativistic calculation yields a collinear ground state in accordance with previous calculations, we find the ground state for the fully relativistic calculation to be slightly non-collinear. We also investigate the influence of variations in the iron concentration on the distribution of magnetic moments.

- Authors:

- ORNL

- Publication Date:

- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Center for Computational Sciences

- Sponsoring Org.:
- USDOE Office of Science (SC)

- OSTI Identifier:
- 931297

- DOE Contract Number:
- DE-AC05-00OR22725

- Resource Type:
- Conference

- Resource Relation:
- Conference: 10th Joint MMM/Intermag Conference, Baltimore, MD, USA, 20070107, 20070111

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 36 MATERIALS SCIENCE; ANISOTROPY; DIRAC EQUATION; GROUND STATES; IRON; MAGNETIC MOMENTS; MAGNETISM; MULTIPLE SCATTERING; PERMALLOY; PHYSICAL PROPERTIES; TRANSPORT

### Citation Formats

```
Eisenbach, Markus, Nicholson, Don M, and Stocks, George Malcolm.
```*Non-Collinear Magnetism in Permalloy*. United States: N. p., 2007.
Web.

```
Eisenbach, Markus, Nicholson, Don M, & Stocks, George Malcolm.
```*Non-Collinear Magnetism in Permalloy*. United States.

```
Eisenbach, Markus, Nicholson, Don M, and Stocks, George Malcolm. Mon .
"Non-Collinear Magnetism in Permalloy". United States.
doi:.
```

```
@article{osti_931297,
```

title = {Non-Collinear Magnetism in Permalloy},

author = {Eisenbach, Markus and Nicholson, Don M and Stocks, George Malcolm},

abstractNote = {Permalloy is an important material in a wide variety of magnetic systems, most notably in GMR read-heads. However, despite this great interest its properties are not fully understood. For an in depth analysis of important physical properties as e.g. electric transport or magnetic anisotropy a detailed understanding of the distribution of magnetic moments on an atomic level is necessary. Using our first principles Locally Self-consistent Multiple Scattering (LSMS) method we calculate the magnetic ground state structure for a large super-cell model of Permalloy. Our code allows us to solve both the usual non-relativistic Schrdinger equation as well as the fully relativistic Dirac equation and to find the magnitude and direction of the magnetic moments at each atomic site. While the non-relativistic calculation yields a collinear ground state in accordance with previous calculations, we find the ground state for the fully relativistic calculation to be slightly non-collinear. We also investigate the influence of variations in the iron concentration on the distribution of magnetic moments.},

doi = {},

journal = {},

number = ,

volume = ,

place = {United States},

year = {Mon Jan 01 00:00:00 EST 2007},

month = {Mon Jan 01 00:00:00 EST 2007}

}