# Interpreting remanence isotherms: a Preisach-based study

Listed:
• R. Roshko

()

• C. Viddal

## Abstract

Numerical simulations of the field dependence of the isothermal remanent moment (IRM) and the thermoremanent moment (TRM) are presented, based on a Preisach formalism which decomposes the free energy landscape into an ensemble of thermally activated, temperature dependent, double well subsystems, each characterized by a dissipation field H d and a bias field H s . The simulations show that the TRM approaches saturation much more rapidly than the corresponding IRM and that, as a consequence, the characteristics of the IRM are determined primarily by the distribution of dissipation fields, as defined by the mean field $\bar {H}_d (T)$ and the dispersion $\sigma_d (T)$ , while the characteristics of the TRM are determined primarily by a mixture of the mean dissipation field $\bar {H}_d (T)$ and the dispersion of bias fields $\sigma_s (T)$ . The simulations also identify a regime $\bar {H}_d \gg\sigma_s$ , where the influence of $\bar {H}_d (T)$ on the TRM is negligible, and hence where the TRM and the IRM provide essentially independent scans of the Preisach distribution along the two orthogonal H s and H d directions, respectively. The systematics established by the model simulations are exploited to analyze TRM and IRM data from a mixed ferromagnetic perovskite Ca 0.4 Sr 0.6 RuO 3 , and to reconstruct the distribution of characteristic fields H d and H s , and its variation with temperature. Copyright Springer-Verlag Berlin/Heidelberg 2004

## Suggested Citation

• R. Roshko & C. Viddal, 2004. "Interpreting remanence isotherms: a Preisach-based study," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 40(2), pages 145-151, July.
• Handle: RePEc:spr:eurphb:v:40:y:2004:i:2:p:145-151
DOI: 10.1140/epjb/e2004-00253-3
as

File URL: http://hdl.handle.net/10.1140/epjb/e2004-00253-3

As the access to this document is restricted, you may want to search for a different version of it.

## Corrections

All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:spr:eurphb:v:40:y:2004:i:2:p:145-151. See general information about how to correct material in RePEc.

For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Sonal Shukla) or (Rebekah McClure). General contact details of provider: http://www.springer.com .

If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

We have no references for this item. You can help adding them by using this form .

If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

Please note that corrections may take a couple of weeks to filter through the various RePEc services.

IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.