Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7
Wei Bao, Z.Q. Mao, Z. Qu, J.W. Lynn
TL;DR
This study uncovers four magnetic phases in Ca3Ru2O7 and clarifies the spin-valve mechanism behind its large magnetoresistive effect through neutron diffraction analysis.
Contribution
It identifies and characterizes multiple magnetic phases and phase transitions in Ca3Ru2O7, elucidating the spin-valve mechanism responsible for its magnetoresistivity.
Findings
Four magnetic phases identified in Ca3Ru2O7
All phase transitions characterized as first or second order
Spin-valve mechanism explains the magnetoresistive effect
Abstract
The laminar perovskite Ca3Ru2O7 naturally forms ferromagnetic double-layers of alternating moment directions, as in the spin-valve superlattices. The mechanism of huge magnetoresistive effect in the material has been controversial due to a lack of clear understanding of various magnetic phases and phase-transitions. In this neutron diffraction study in a magnetic field, we identify four different magnetic phases in Ca3Ru2O7 and determine all first-order and second-order phase transitions between them. The spin-valve mechanism then readily explains the dominant magnetoresistive effect in Ca3Ru2O7.
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