Disclosure of Invention
The invention aims to at least solve one technical problem in the prior art, and provides a reaction chamber and thin film deposition equipment.
As one aspect of the present invention, the present invention provides a reaction chamber, comprising a base and a bias magnet assembly disposed around the base, wherein a bias magnet lifting mechanism is further included for driving the bias magnet assembly to perform a lifting motion.
The bias magnet lifting mechanism comprises a lifting unit and a driving unit, the lifting unit is connected with the driving unit and the bias magnet assembly respectively, and the driving unit is used for driving the lifting unit to lift so as to drive the bias magnet assembly to move up and down.
The bias magnet lifting mechanism further comprises a first connecting support plate, and the bias magnet assembly is connected with the lifting unit through the first connecting support plate.
The reaction chamber further comprises a thimble, the bias magnet lifting mechanism further comprises a second connecting support plate, and the thimble is connected with the lifting unit through the second connecting support plate so as to drive the thimble and the bias magnet assembly to synchronously lift under the driving of the driving unit.
Wherein, a target is arranged in the reaction chamber, and the distance between the bias magnet assembly and the target ranges from 90mm to 180 mm.
The device also comprises a base lifting mechanism for driving the base to move up and down, and the value range of the height difference between the bias magnet assembly and the base is 0-10 mm.
The reactor also comprises a lining, wherein the lining surrounds the inner side of the side wall of the reaction chamber, and a preset distance is reserved between the lining and the side wall of the reaction chamber so as to allow the bias magnet assembly to ascend to a position between the lining and the side wall.
Wherein the liner comprises a vertical portion and an inclined portion, wherein,
the vertical part surrounds the inner side of the side wall of the reaction chamber, and a preset distance is formed between the vertical part and the side wall of the reaction chamber;
the inclined part surrounds the inner side of the side wall of the reaction chamber and is positioned above the vertical part, the lower end of the inclined part is connected with the upper end of the vertical part into a whole, and the upper end of the inclined part is fixedly connected with the side wall of the reaction chamber.
Wherein, the material of the lining is nonmagnetic material.
As another aspect of the present invention, the present invention further provides a thin film deposition apparatus, including a reaction chamber, wherein the reaction chamber is the reaction chamber provided by the present invention.
The invention has the following beneficial effects:
the reaction chamber provided by the invention comprises a base, a bias magnet assembly arranged around the base and a bias magnet lifting mechanism used for driving the bias magnet assembly to move up and down, so that the distance between the bias magnet assembly and a target material is adjustable, and when deposition of different materials and different process requirements is carried out, the uniformity of an anisotropic horizontal magnetic field can be improved by adjusting the height of the bias magnet assembly, thereby expanding the application range of the reaction chamber.
According to the film deposition equipment provided by the invention, the reaction chamber provided by the invention is adopted, so that the distance between the bias magnet assembly and the target is adjustable, and when deposition of different materials and different process requirements is carried out, the uniformity of an anisotropic horizontal magnetic field can be improved by adjusting the height of the bias magnet assembly, and the application range of the reaction chamber is expanded.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the reaction chamber and the plasma generating apparatus provided by the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 2 is a schematic structural diagram of a reaction chamber according to a first embodiment of the present invention. As shown in fig. 2, a first embodiment of the present invention provides a reaction chamber including abase 1, abias magnet assembly 2, and a biasmagnet elevating mechanism 23, wherein thebias magnet assembly 2 is disposed around the base to form a horizontal magnetic field above the base, and the bias magnetelevating mechanism 23 is used to drive thebias magnet assembly 2 to perform an elevating motion.
In the reaction chamber provided in the first embodiment of the present invention, the biasmagnet lifting mechanism 23 is configured to drive thebias magnet assembly 2 to perform lifting movement, so that the distance between thebias magnet assembly 2 and thetarget 3 is adjustable, and when deposition is performed on different materials and with different process requirements, the uniformity of the horizontal anisotropic magnetic field can be improved by adjusting the height of thebias magnet assembly 2, thereby expanding the application range of the reaction chamber.
As shown in fig. 2, in the first embodiment of the present invention, the biasmagnet lifting mechanism 23 includes a lifting unit and a driving unit, the lifting unit is respectively connected to the driving unit and thebias magnet assembly 2, and the driving unit is configured to drive thebias magnet assembly 2 to perform lifting movement so as to drive thebias magnet assembly 2 to perform lifting movement.
In the present embodiment, the driving unit is used only to drive thebias magnet assembly 2 to ascend and descend. At this time, the biasmagnet elevating mechanism 23 further includes a first connection support plate, and thebias magnet assembly 2 is connected to the elevating unit through the first connection support plate connection.
The driving unit may be a linear driving source, such as a motor, or a rotary driving source, and when the driving unit is a rotary driving source, the lifting unit is a lead screw, and the rotary motion output by the rotary driving source is converted into a linear motion through the lead screw to drive thebias magnet assembly 2 to perform a lifting motion. In addition, in order to ensure the vacuum degree and cleanliness in the reaction chamber, it is preferable that the bias magnet elevating mechanism further includes a vacuum bellows which is connected to the lower ends of the reaction chamber and the bias magnet assembly, respectively, and isolates the space around the driving unit and the elevating unit from the reaction chamber.
In this embodiment, the reaction chamber further comprises a lift pin mechanism for lifting the workpiece placed on the carrying surface of thesusceptor 1 or lowering the workpiece placed on the lift pin to be placed on the carrying surface of thesusceptor 1. The thimble mechanism comprises athimble 51 and athimble driving mechanism 52, and thethimble driving mechanism 52 is connected with thethimble 51 and is used for driving thethimble 51 to move up and down.
In summary, in the present embodiment, thebias magnet assembly 2 and thethimble 51 are driven by different driving units respectively.
In this embodiment, the reaction chamber further includes a susceptor lifting mechanism, and the susceptor lifting mechanism is connected to thesusceptor 1 and is used for driving thesusceptor 1 to perform lifting movement. Further, in the present embodiment, thetarget 3 is disposed in the reaction chamber, and the uniformity of the horizontal anisotropic magnetic field is improved by adjusting at least two of the distance between thebias magnet assembly 2 and thetarget 3, the distance between thebase 1 and thetarget 3, and the distance between thebias magnet assembly 2 and thebase 1.
The adjustment principle of the distance between thebias magnet assembly 2 and thetarget 3, the distance between thebase 1 and thetarget 3, and the distance between thebias magnet assembly 2 and thebase 1 will be described in detail with reference to the drawings.
First, as shown in fig. 4, during the deposition process, the central region of thesusceptor 1 is easy to deposit, and the edge of the susceptor is not easy to deposit, thereby forming a thickness difference that the deposit is thicker in the middle region and thinner in the edge region. Among them, the distance between thesusceptor 1 and thetarget 3 has a great influence on such a deposition difference, and specifically, when the distance between thesusceptor 1 and thetarget 3 is increased, the thickness difference between the middle region and the edge region becomes large, and uniformity becomes poor. According to the embodiment of the invention, the base lifting mechanism is arranged to drive thebase 1 to move up and down, and the distance between thebase 1 and thetarget 3 is adjusted, so that the deposition uniformity is improved.
Secondly, as shown in fig. 5, thebias magnet assembly 2 has different magnetic poles at two ends of thebase 1, and during deposition, different magnetic poles have different actions on the deposited magnetic material atomic groups/molecular groups, one is repulsive and the other is attractive, so that a thickness difference is formed from thick to thin from one end to the other end, and the gradient change is large, and the uniformity of the magnetic thin film is poor. Specifically, the closer the distance between thebias magnet assembly 2 and thetarget 3, the greater the difference in thickness from one end to the other. The embodiment of the invention improves the deposition uniformity by adjusting the distance between thebias magnet assembly 2 and thetarget 3.
Third, thebase 1 must be within the influence of thebias magnet assembly 2 in order to achieve a higher anisotropy level field uniformity.
As described above, the film uniformity increases with the distance between thesusceptor 1 and thetarget 3, and when the distance between thesusceptor 1 and thetarget 3 is greater than 190mm, the deposition uniformity may become poor and difficult to adjust. Therefore, in order to obtain better deposition uniformity and uniformity of the horizontal anisotropic magnetic field, it is preferable that the distance between thebias magnet assembly 2 and thetarget 3 is in a range of 90mm to 180mm, and the height difference between thebias magnet assembly 2 and thebase 1 is in a range of 0mm to 10 mm.
In this embodiment, the liner structure of the prior art is modified by the present invention to accommodate the lifting and lowering movement of thebias magnet assembly 2. As shown in fig. 2, in the present embodiment, the liner surrounds the inner side of the sidewall of the reaction chamber, and a predetermined distance is provided between the liner and the sidewall of the reaction chamber, so that thebias magnet assembly 2 can be allowed to rise to a position between the liner and the sidewall by setting the predetermined distance.
Specifically, the liner includes avertical portion 41 and aninclined portion 42, wherein thevertical portion 41 surrounds the inner side of the sidewall of the reaction chamber with the preset interval therebetween; theinclined portion 42 surrounds the inner side of the sidewall of the reaction chamber and is located above thevertical portion 41, and the lower end of theinclined portion 42 is integrally connected to the upper end of thevertical portion 41, and the upper end of theinclined portion 42 is fixedly connected to the sidewall of the reaction chamber.
Wherein the material of the inner liner is a non-magnetic material to prevent affecting the effect of thebias magnet assembly 2 in creating the bias magnetic field.
Fig. 3 is a schematic structural view of a bias magnet assembly used in the first embodiment of the present invention. As shown in fig. 3, in the present embodiment, thebias magnet assembly 2 includes afirst magnet group 21 and asecond magnet group 22, and thefirst magnet group 21 and thesecond magnet group 22 are disposed around thebase 1 and are symmetrically disposed with respect to the axis of thebase 1. Thefirst magnet group 21 includes a plurality of first magnets arranged at intervals in the circumferential direction of thebase 1, and thesecond magnet group 22 includes a plurality of second magnets arranged at intervals in the circumferential direction of thebase 1. Wherein the magnetic pole directions of the plurality of first magnets and the plurality of second magnets are arranged in the radial direction of thebase 1, and the N-pole of each first magnet is directed to thebase 1 and the S-pole of each second magnet is directed to thebase 1.
The reaction chamber provided by the invention can be used for depositing NiFe permalloy, such as Ni80Fe20、Ni45Fe55、Ni81Fe19Etc.; amorphous magnetic materials of CoZrTa, e.g. Co91.5Zr4.0Ta4.5Etc.; magnetic materials based on Co, Fe, Ni, etc., e.g. Co60Fe40NiFeCr, etc.; or other magnetic material.
Fig. 6 is a schematic structural diagram of a reaction chamber according to a second embodiment of the present invention. The second embodiment of the present invention provides a reaction chamber, which comprises the same structure of thebase 1, thebias magnet assembly 2, the thimble mechanism, thetarget 3, the liner, etc. compared with the first embodiment, the difference is only that the specific structure of the bias magnet lifting mechanism is different.
In this embodiment, as shown in fig. 6, the biasmagnet lifting mechanism 23 further includes a second connecting support plate, and thethimble 51 is connected to the lifting unit through the second connecting support plate, so as to drive thethimble 51 to move up and down synchronously with thebias magnet assembly 2 under the driving of the driving unit.
The driving unit may be a pin driving mechanism used in the prior art to drive thepin 51.
In the second embodiment of the present invention, the driving units are respectively connected to thebias magnet assembly 2 and thethimble 51, and the existing thimble driving unit in the reaction chamber is used to connect the driving unit to thebias magnet assembly 2, so that the lifting of thebias magnet assembly 2 can be realized, and therefore, the modification of the reaction chamber is small, and meanwhile, compared with the mode that the driving unit and thethimble driving mechanism 52 are respectively arranged on thebias magnet assembly 2 and thethimble 51 in the first embodiment, an independent bias magnet assembly driving source is not required to be additionally arranged, thereby simplifying the structure of the reaction chamber, reducing the cost, and reducing the volume of the equipment in the reaction chamber.
It should be noted that, since thethimble 51 and the offsetmagnet assembly 2 are lifted synchronously, in order to avoid driving the offsetmagnet assembly 2 to lift during the process and further enable thethimble 51 lifted synchronously to lift the workpiece from thebase 1, in the present embodiment, the height relationship among thethimble 51, the offsetmagnet assembly 2 and thebase 1 should be calculated in advance, for example, when the offsetmagnet assembly 2 is located at the highest position, the upper end of thethimble 51 should be lower than the position of the bearing surface of thebase 1.
As another aspect of the present invention, the present invention also provides a thin film deposition apparatus including a reaction chamber, which is provided in an embodiment of the present invention.
According to the film deposition equipment provided by the invention, the reaction chamber provided by the invention is adopted, so that the distance between the bias magnet assembly and the target is adjustable, and when deposition of different materials and different process requirements is carried out, the uniformity of an anisotropic horizontal magnetic field can be improved by adjusting the height of the bias magnet assembly, and the application range of the reaction chamber is expanded.
The thin film deposition equipment provided by the invention comprises but is not limited to physical thin film deposition equipment.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.