Magnetoelectric Recording Layer Exchange Coupling Adjustment
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Solution Overview
Problem
Current spintronic technologies face limitations in miniaturization and energy efficiency due to the need for large exchange coupling and coercive force in magnetoelectric (ME) recording systems, which can lead to excessive energy requirements and dielectric breakdown when trying to reverse magnetic poles in magnetic recording devices like MRAMs and hard disks.
Innovation Solution
A multilayer structure is introduced with an exchange coupling adjustment layer between an antiferromagnetic and a ferromagnetic layer, using transition metal elements, light metals, or semiconductor elements with atomic numbers 45 or lower to adjust exchange coupling without increasing coercive force, allowing for magnetization reversal even with small exchange bias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exchange coupling at the interface between antiferromagnetic and ferromagnetic materials is increased to achieve full magnetic pole reversal, then magnetization switching capability is improved, but the energy required for the magnetoelectric effect increases excessively
Solution Approach 1:
The invention changes the material composition parameters by introducing specific elements (Ru, Rh, Ir, Os, Re, Pt, Au, Cu, Ag, In, Sn, Sb, Te, Hf, Ta, W, Au, or their combinations) into the antiferromagnetic material layer. These compositional changes modify the exchange coupling strength and magnetic properties, enabling magnetization reversal at lower energy consumption while maintaining switching capability.
Solution Approach 2:
The invention creates composite antiferromagnetic materials by combining base antiferromagnetic materials (such as MnIr, MnPt, MnAu, MnCu, MnIn, MnSn, MnSb, MnTe, MnHf, MnTa, MnW) with specific additive elements. This composite approach optimizes both the exchange coupling strength and the energy efficiency, achieving a balance between magnetization switching capability and energy consumption.
2Ease of manufacture
If Pt or Pd is inserted at the interface to adjust exchange coupling, then exchange coupling magnitude can be changed, but the coercive force becomes larger than exchange bias in the operational temperature range, preventing magnetic pole reversal
Solution Approach 1:
The invention changes the interface material composition by replacing Pt or Pd with elements having different magnetic and exchange coupling properties (Ru, Rh, Ir, Os, Re, Au, Cu, Ag, In, Sn, Sb, Te, Hf, Ta, W). These compositional parameter changes adjust the exchange coupling strength while maintaining coercive force below the exchange bias threshold, enabling successful magnetization reversal.
Solution Approach 2:
The invention uses alternative elements that replicate the beneficial interface properties needed for exchange coupling adjustment without reproducing the harmful effect of excessive coercive force. The selected elements copy the desired exchange coupling characteristics while avoiding the magnetization pinning problem caused by Pt and Pd.
3Use of energy by moving object
If the magnitude of coercive force is reduced to enable magnetization reversal with small exchange bias, then energy consumption is reduced, but the ability to maintain stable magnetic recording decreases
Solution Approach 1:
The invention optimizes the magnetic material composition by incorporating specific elements that simultaneously reduce coercive force and enhance magnetic anisotropy. This compositional optimization allows magnetization reversal at lower energy consumption while maintaining stable magnetic recording through enhanced anisotropy that preserves magnetic state stability.
Solution Approach 2:
The invention employs composite ferromagnetic materials containing specific element combinations that provide both low coercive force and high magnetic stability. The composite structure enables decoupling of these two properties, achieving low energy consumption for switching while maintaining recording stability through material composition design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient magnetization control and magnetic recording by maintaining a coercive force lower than exchange bias, reducing the required electric field and preventing dielectric breakdown, thus enhancing energy efficiency and recording capabilities.
Implementation Method 1
a first ME recording layer 101 containing mainly an antiferromagnetic material having an ME effect... The first ME recording layer 101 contains mainly an antiferromagnetic material or ferrimagnetic material having an ME effect
Implementation Method 2
a third ME recording layer 103 which is disposed between the first ME recording layer 101 and the second ME recording layer 102 and has a function of adjusting exchange coupling
Implementation Method 3
a second ME recording layer 102 containing mainly a ferromagnetic material... The second ME recording layer 102 contains a ferromagnetic material having a magnetization component perpendicular to the film surface
Data Source
AI summary
A magnetization controlling element includes a ferromagnetic material layer, an exchange coupling adjustment layer, an antiferromagnetic material layer, an electrode layer, a magnetic field applying mechanism which applies a magnetic field to the antiferromagnetic material layer, and an electric field applying mechanism which applies an electric field to the antiferromagnetic material layer. The antiferromagnetic material layer contains an antiferromagnetic material or ferrimagnetic material having a magnetoelectric effect, the ferromagnetic material layer includes a perpendicular magnetization film having a magnetization component perpendicular to the film surface, the ferromagnetic material layer includes a ferromagnetic material layer that is magnetically connected, through exchange coupling, to the antiferromagnetic material layer. The exchange coupling adjustment layer has a function of adjusting exchange coupling between the ferromagnetic material layer and the antiferromagnetic material layer.