Abstract
Magnetic thin films are indispensable in flexible devices, which necessitate methods to fabricate flexible magnetic thin films. In this work, we present a method to fabricate wrinkled FeRh flexible films via a coating and transfer process. The obtained FeRh/PDMS films have random patterns of wrinkles with a mean periodicity of 10 μm. From the curvature dependent magnetic measurements, it can be determined that the magnetic properties of the obtained wrinkled FeRh flexible films are insensitive to flexing up to a radius of curvature of 1.5 mm, making it promising for applications in flexible devices.
Highlights
INTRODUCTIONFlexible device which is fabricated on plastic/polymer substrates have drawn people’s attention because of the promise in applications such as smart cards, wearable electronics, sensors, etc. Since magnetic layers are a key component of these flexible devices, flexible magnetic films have attracted wide attention. FeRh alloy which has CsCl-type structure have been used widely as one of the magnetic layer in magnetic devices, such as in magnetic recording, because of the first-order phase transition which changed from antiferromagnetic (AF) at room temperature to ferromagnetic (FM) phase upon heating above 300 K.6–8 Due to this magnetic transition, FeRh has attracted extensive attention for its potential application in spintronic devices. the growth temperature of FeRh thin films is too high for most plastic/polymer substrates, which is a challenge to produce flexible FeRh thin films. On the other hand, the magnetic properties of FeRh can be changed by applying strain to the flexible substrate due to inverse magnetostrictive effects and magnetoelastic coupling. As a result, the original magnetic state will be changed
It can be seen that the magnetization is rather small at room temperature, and gradually increases during the heating process, indicating the typical AF-FM phase transition of FeRh
The hysteresis loops of FeRh/PDMS measured at 250 and 400 K in Fig. 2(d) are similar with that of FeRh films grown on other rigid substrates,10 indicating that the obtained wrinkled FeRh thin films have similar magnetic properties with that of FeRh thin films grown on rigid substrates
Summary
Flexible device which is fabricated on plastic/polymer substrates have drawn people’s attention because of the promise in applications such as smart cards, wearable electronics, sensors, etc. Since magnetic layers are a key component of these flexible devices, flexible magnetic films have attracted wide attention. FeRh alloy which has CsCl-type structure have been used widely as one of the magnetic layer in magnetic devices, such as in magnetic recording, because of the first-order phase transition which changed from antiferromagnetic (AF) at room temperature to ferromagnetic (FM) phase upon heating above 300 K.6–8 Due to this magnetic transition, FeRh has attracted extensive attention for its potential application in spintronic devices. the growth temperature of FeRh thin films is too high for most plastic/polymer substrates, which is a challenge to produce flexible FeRh thin films. On the other hand, the magnetic properties of FeRh can be changed by applying strain to the flexible substrate due to inverse magnetostrictive effects and magnetoelastic coupling. As a result, the original magnetic state will be changed. FeRh alloy which has CsCl-type structure have been used widely as one of the magnetic layer in magnetic devices, such as in magnetic recording, because of the first-order phase transition which changed from antiferromagnetic (AF) at room temperature to ferromagnetic (FM) phase upon heating above 300 K.6–8 Due to this magnetic transition, FeRh has attracted extensive attention for its potential application in spintronic devices.. Due to the repeatedly stretched and fully recovered nature, artificial wrinkling structures have been widely used in fabricating different stretchable electronics.21–31 This kind of structure can be used to prepare the flexible magnetic films in which the magnetic properties are insensitive to the applied strain during bending or stretching. FIG. 1. [(a)–(d)] Step-by-step process for fabricating flexible FeRh/PDMS thin films with random wrinkles
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