The magnetic hysteresis loops under different piezo-voltages (from À40 V to 90 V, step is 10 V) along the in-plane [110] and [1À10] directions of the sample II. (a) The magnetic hysteresis loops in the [110] direction change to square curves from two-step curves with U PZT > 20 V (stretched states). (b) The magnetic hysteresis loops in the [110] direction keep the two-step curves with U PZT < À20 V and the saturation field increase with the negative piezo-voltage increase. (c) The magnetic hysteresis loops in the [1À10] direction are changed to two-step curves from square curves with U PZT > 40 V. (d) The magnetic hysteresis loops keep the square curve with U PZT < À20 V in the [1À10] direction.

Contexts in source publication

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... to the measurement of sample I, we have detected the variations of the magnetic hysteresis loops along the [110], [1À10] and [100] directions under positive and negative piezo-voltages. Fig. 4a and b show the loops of the [110] crystal direction with the piezo-voltages. With the stress parallel to the [110] direction, the manipulation phenomenon of VCMA is obvious. When we applied a positive piezo-voltage to the PZT, the loop of the [110] direction changes to a square curve from a two-step loop, which indicates that [110] has been ...

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... of VCMA is obvious. When we applied a positive piezo-voltage to the PZT, the loop of the [110] direction changes to a square curve from a two-step loop, which indicates that [110] has been converted to an easy magnetized axis. However, the [110] direction keeps a two-step loop under the negative piezo-voltages (compressed state) (as shown in Fig. 4b). The saturation eld increased with the piezo-voltages changing from À20 to À50 V. In order to analyze the variation of magnetocrystalline anisotropy, we measured the magnetic hysteresis loop of the [1À10] direction under positive and negative piezovoltages. In contrast to sample I, the magnetic hysteresis loops of the [1À10] varied ...

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... to analyze the variation of magnetocrystalline anisotropy, we measured the magnetic hysteresis loop of the [1À10] direction under positive and negative piezovoltages. In contrast to sample I, the magnetic hysteresis loops of the [1À10] varied from a square curve to a two-step loop with the piezo-voltage increasing from À10 to 60 V (as shown in Fig. 4c). Under the negative piezo-voltages, the loops of the [1À10] direction keep the square curve stabilized (as shown in Fig. 4d). We also measured the magnetic hysteresis loops of the [100] hard magnetic axis and the loops maintained the hard magnetic properties with the positive or negative piezo-voltages (only a part of the loops shown ...

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... under positive and negative piezovoltages. In contrast to sample I, the magnetic hysteresis loops of the [1À10] varied from a square curve to a two-step loop with the piezo-voltage increasing from À10 to 60 V (as shown in Fig. 4c). Under the negative piezo-voltages, the loops of the [1À10] direction keep the square curve stabilized (as shown in Fig. 4d). We also measured the magnetic hysteresis loops of the [100] hard magnetic axis and the loops maintained the hard magnetic properties with the positive or negative piezo-voltages (only a part of the loops shown in Fig. 5b). Through the magnetic measurement along different directions, we summarized the variation of the saturated eld ...