The magnetization state of magnetite controls acquisition and stability of remanent magnetization in Earth and planetary rocks. Although commonly interpreted in terms of grain size, also stress, grain shape, and magnetostatic interactions can substantially modify magnetic stability. Here, we show that scaled reversible work (SRW) in the approach-to-saturation (ATS) of hysteresis curves is temperature independent if anisotropy is due to demagnetizing energy. Stress anisotropy vanishes with increasing temperature. With a new measurement and evaluation procedure stress-induced anisotropy is separated from demagnetization effects. We calibrated the new method using theoretical ATS curves for different stress and demagnetization regimes. Experimental results for synthetic magnetite samples underpin the validity of the method and provide insight into the relationship between magnetostatic, magnetocrystalline, and stress energies. The SRW method provides a new tool to study the reliability of paleomagnetic recording mechanisms, and enables quantitative investigation of stresses due to tectonics, meteorite impacts, oxidation, exsolution, or quenching.

中文翻译：

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来自温度相关磁滞测量的磁铁矿中的退磁能和内应力

磁铁矿的磁化状态控制着地球和行星岩石中剩余磁化强度的获取和稳定性。尽管通常根据晶粒尺寸进行解释，但应力、晶粒形状和静磁相互作用也可以显着改变磁稳定性。在这里，我们表明，如果各向异性是由退磁能引起的，则磁滞曲线的趋近饱和 (ATS) 中的缩放可逆功 (SRW) 与温度无关。应力各向异性随温度升高而消失。通过新的测量和评估程序，应力引起的各向异性与退磁效应分离。我们使用不同应力和退磁状态的理论 ATS 曲线校准新方法。合成磁铁矿样品的实验结果巩固了该方法的有效性，并提供了对静磁、磁晶和应力能量之间关系的深入了解。SRW 方法为研究古地磁记录机制的可靠性提供了一种新工具，并能够对由于构造、陨石撞击、氧化、出溶或淬火引起的应力进行定量研究。