TH13012U - Spin Seebeck effect measurement device - Google Patents

Abstract

Updated 24/11/2016. The Spin-Seebeck effect measurement device consists of three main parts: 1. A variable magnetic field source, 2. A temperature difference unit, and 3. A potential difference measurement unit. The variable magnetic field source has been developed to be a solenoid coil type and is also temperature adjustable. Furthermore, the potential difference measurement unit can rotate 360 degrees. The Spin-Seebeck effect measurement device is a small, compact, and portable instrument for measuring spin-Seebeck signals in magnetic materials. --------------------- The Spin-Seebeck effect measurement device consists of three main parts: 1. A variable magnetic field source, 2. A temperature difference unit, and 3. A potential difference measurement unit. The variable magnetic field source has been developed to be a solenoid coil type and is also temperature adjustable. Furthermore, the potential difference measurement unit can rotate 360 degrees. The spin-Seebeck effect meter is a small, compact, and portable tool for measuring spin-Seebeck signals in magnetic materials.

Claims (7)

Updated 24/11/2016 1. The Spin Seebeck Effect Measurement Device consists of three parts: the adjustable magnetic field source (50), the temperature difference unit (30), and the potential difference measurement unit (19). The adjustable magnetic field source (50) consists of a wire (1), a core (2), a Mylar insulation sheet (3), an outer wall (5), a wall (7), a helium filling tube (8), a liquid nitrogen filling tube (9), a hollow metal tube (11), a suction tube (12), a pump tube (13), and an O-ring (14). The adjustable magnetic field source (50) is a cylindrical tank with walls enclosed on all sides and has two side walls: an outer wall (5) and an inner wall (7). The inner wall (7) is a thermal insulator and separates the interior space of the adjustable magnetic field source (50) into two parts: the inner area (4) and the outer area (6). The inner area (4) It is the area enclosed by the inner wall (7), in which the inner area (4) is used for filling with liquid helium. The outer area (6) is the area between the outer wall (5) and the inner wall (7), in which the outer area (6) is used for filling with liquid nitrogen. The inner wall (7) prevents the liquid helium and liquid nitrogen from mixing and also prevents the heat transfer of liquid helium to liquid nitrogen. On the top closed wall of the tunable magnetic field source (50), there are several helium filling pipes (8) connected to and penetrating into the inner area (4), and there is one liquid nitrogen filling pipe (9) connected to and penetrating into the outer area (6). In the inner area (4) of the tunable magnetic field source (50), there is a shaft (2) installed. The shaft (2) is a hollow tube with an open top end. The open top end of the shaft (2) is connected to the top wall of the tunable magnetic field source. (50) The top wall of the adjustable magnetic field source (50) has a hole drilled through to the open top end of the core (2) for inserting a hollow metal tube (11) into the magnetic field. Around the core (2), wire (1) is wound in layers around the core (2), and between the layers of coil (1) wound around the core (2) there are Mylar sheets (3) for insulation. Coil (1) is coated with an electrical insulating agent to prevent short circuits. At the head and tail of coil (1), there are Mylar sheets (3) welded together. Coil (1) immersed in liquid helium causes coil (1) to be in a superconducting state. The hollow metal tube (11) is a hollow tube with an open top end and is inserted inside the core (2), with the open end of the hollow metal tube (11) protruding beyond the core (2). The area at the end of the hollow metal tube (11) that protrudes beyond The suction pipe (12) and the pump pipe (13) are connected. The suction pipe (12) and the pump pipe (13) are through-hole pipes that go into the hollow metal pipe (11). The suction pipe (12) is used to draw air out of the hollow metal pipe (11) to create a vacuum, and the pump pipe (13) is used to pump argon gas in to remove moisture from the hollow metal pipe (11). The part of the hollow metal pipe (11) that extends beyond the core (2) is covered with thermal insulation (15) to prevent external heat from affecting the temperature inside the hollow metal pipe (11). The top of the hollow metal pipe (11) has a groove for inserting an O-ring (14) to act as a barrier between the hollow metal pipe (11) and the ring (17), which is a component of the potential difference measurement unit (30). The O-ring (4) also prevents air from flowing into the hollow metal pipe (11). Inside the hollow metal pipe (11), the potential difference measurement unit (30) is inserted. The potential difference measuring unit (30) is a cold-conducting metal rod consisting of a ring (17), a support base (18), a wire (20), and a central rod (31). The ring (17) acts as an air barrier inside the hollow metal tube (11). The bottom of the ring (17) is connected to one end of the central rod (31), which is long and thin. The other end of the central rod (31) is connected to the support base (18), which is the base for the temperature differential unit (19). Several wires (20) are installed in the central rod (31) for connecting to external devices to receive and transmit signals to the spin-Seebeck effect measuring device. The wires (20) are connected to the thermocouple (21) and the heater (22) of the temperature differential unit (19) to control its operation and transmit signals for potential difference measurement. The temperature differential unit (19) consists of a thermocouple. (Thermocouple) (21) Heater (22) Hot part (23) Cold part (24) Nut (40) Base (26) The hot part (23) is rectangular in shape and acts as a heat transfer medium to the surface of the object being tested (27). The back of the hot part (23) is in contact with one side of the surface of the object being tested (27), while the front of the hot part (23) is connected to the heater (22) to transfer heat to the hot part (23), keeping the temperature hot and constant. The back of the hot part (23) is in contact with the surface of the object being tested (27), and the back surface of the object being tested (27) is connected to the cold part (24), which is rectangular in shape and acts as a heat transfer medium. A constant cooling is applied to the bottom surface of the object being tested (27), with the cold section (24) receiving cooling from a ring (17) which is transferred from a hollow metal tube (11) controlled by a temperature control tube (16) for the hot section (23). The cold section (24) and the object being tested (27) are held together by a number of nuts (40). The back of the cold section (24) is connected to a base (26), which is the part that holds the temperature difference unit (19) mounted on the support base (18) of the potential difference unit, to which a thermocouple (21) is mounted, which indicates the temperature difference between the hot section (23) and the cold section (24), sending the measured temperature difference signal to an external reader via a wire (20) which has a specific characteristic. The outer surface of the hollow metal tube (11) has a thermostat (16) wrapped around it, which is connected to a cooling unit to perform heat exchange and maintain the temperature of the vacuum system. The back of the cooling section (24) is connected to the base (26) by a nut (25) which holds it in place and allows the hot section (23), the cold section (24), and the object being tested (27) to be rotated 360 degrees. 2. Spin Seebeck effect measuring device according to claim 1, in which the top wall of the adjustable magnetic field source (50) is fitted with a number of handles (10) for the purpose of holding and moving the spin Seebeck effect measuring device. 3. Spin Seebeck effect measurement device according to claim 1 or 2, where the shaft (2) is made of alloy and has a diameter of 25-40 millimeters. 4. Spin Seebeck effect measurement device according to one of the claims 1 - 3, where the appropriate hole size inside the shaft (2) has a diameter of 20-30 millimeters and a length of 250-300 millimeters. 5. Spin Seebeck effect signal measurement device according to one of the claims 1 - 4, where the wire (1) is a solenoid wire with a size of 0.5-1 millimeter. 6. Spin Seebeck effect measurement device according to any one of claims 1 - 5, in which Mylar sheet (3) with a thickness of 0.5-1 millimeters. 7. Spin Seebeck effect measuring device according to any one of the claims 1 - 5, where the potential difference measuring unit (30) is a metal rod 250-300 mm long. --------------------- The spin Seebeck effect measuring device consists of 3 parts: the adjustable magnetic field source (50), the temperature difference unit (30), and the potential difference measuring unit (19). The adjustable magnetic field source (50) consists of wire (1), core (2), Mylar insulation sheet (3), outer wall (5), wall (7), helium filling tube (8), liquid nitrogen filling tube (9), hollow metal tube (11), suction tube (12), pump tube (13), O-ring (14). The adjustable magnetic field source (50) is in the form of a cylindrical tank with closed walls on all sides and 2 side walls consisting of an outer wall (5). and the inner wall (7), where the inner wall (7) is a thermal insulation wall and separates the interior space of the adjustable magnetic field source (50) into 2 parts: the inner area (4) and the outer area (6). The inner area (4) is the area that the inner wall (7) surrounds, which is used for filling with liquid helium. The outer area (6) is the area between the outer wall (5) and the inner wall (7), which is used for filling with liquid nitrogen. The inner wall (7) prevents the liquid helium and liquid nitrogen from mixing and also acts as a barrier to the heat diffusion of liquid helium to liquid nitrogen. In the upper closed wall of the tunable magnetic field source (50), several helium tubes (8) are connected and penetrate into the inner area (4), and one liquid nitrogen tube (9) is connected and penetrates into the outer area (6). In the inner area (4) of the tunable magnetic field source (50), a core (2) is installed. The core (2) is a hollow tube with an open top end. The open top end of the core (2) is connected to the upper wall of the tunable magnetic field source (50), and the upper wall of the tunable magnetic field source (50) has a hole that goes straight down to the open top end of the core (2) for inserting a hollow metal tube (11) into the magnetic field. Around the core (2), layers of wire (1) are wound around the core (2), and between the layers of wire (1) wound around the core (2) are Mylar insulation sheets (3) for insulation. The wire (1) is coated with a varnish. The electrical insulation to prevent short circuits at the head and tail ends of the wire (1) is sealed with Mylar sheets (3). The coil (1) immersed in liquid helium causes the coil (1) to be in a superconducting state. The hollow metal tube (11) is a hollow tube with an open end at the top and is inserted inside the core (2). The open end of the hollow metal tube (11) extends beyond the core (2), and at the extended end of the hollow metal tube (11) it connects the suction tube (12) and the pump tube (13). The suction tube (12) and the pump tube (13) are tubes with holes that go through the hollow metal tube (11). The suction tube (12) is used to draw the air inside the hollow metal tube (11) to create a vacuum, and the pump tube (13) is used to pump the argon gas into it. To allow argon gas to expel moisture from the hollow tube (11), the area of the hollow tube (11) that protrudes beyond the core (2) is covered with thermal insulation (15) to prevent external heat from affecting the temperature inside the hollow tube (11). The top of the hollow tube (11) has a groove for inserting an O-ring (14) to act as a barrier between the hollow tube (11) and the ring (17), which is a component of the potential difference gauge (30). The O-ring (4) also prevents air from entering the hollow tube (11) cavity. Inside the hollow tube (11) is the potential difference gauge (30), which is a cooling rod. It consists of a ring (17), a support base (18), wires (20), and a central rod (31). The ring (17) acts as an air barrier inside the hollow metal tube (11). The bottom of the ring (17) is connected to one end of the central rod (31), which is long and thin, and the other end of the central rod (31) is connected to the support base (18), which is the base for the differential temperature unit (19). A number of wires (20) are installed in the central rod (31) for connecting to external devices to receive and transmit signals to the spin-Seebeck effect detector. The wires (20) are connected to the thermocouple (21) and heater (22) of the differential temperature unit (19) to control its operation and transmit signals for measuring the potential difference. The differential temperature unit (19) consists of a thermocouple. (Thermocouple) (21) Heater (22) Hot part (23) Cold part (24) Nut (40) Base (26) The hot part (23) is rectangular in shape and acts as a heat transfer medium to the surface of the object being tested (27). The back of the hot part (23) is in contact with one side of the surface of the object being tested (27), while the front of the hot part (23) is connected to the heater (22) to transfer heat to the hot part (23), keeping the temperature hot and constant. The back of the hot part (23) is in contact with the surface of the object being tested (27), and the back surface of the object being tested (27) is connected to the cold part (24), which is rectangular in shape and acts as a heat transfer medium. A constant cooling is applied to the bottom surface of the object being tested (27), with the cold section (24) receiving cooling from a ring (17) which is transferred from a hollow metal tube (11) controlled by a temperature control tube (16) for the hot section (23). The cold section (24) and the object being tested (27) are held together by a number of nuts (40). The back of the cold section (24) is connected to a base (26), which is the part that holds the differential temperature unit (19) mounted on the base (18) of the differential temperature unit, to which a thermocouple (21) is mounted, which indicates the temperature difference between the hot section (23) and the cold section (24), sending the measured temperature difference signal to an external reader via a wire (20) which has a specific characteristic. The outer surface of the hollow metal tube (11) has a thermoregulating tube (16) wrapped around it, which is connected to a cooling unit to perform heat exchange and maintain the temperature of the vacuum system. The back of the cold section (24) is connected to the base (26) by a nut (25) which holds it in place and allows the hot section (23), the cold section (24), and the test object (27) held together to rotate 360 degrees. Spin-Seebeck effect detector according to claim 1, in which the top wall of the adjustable magnetic field source (50) is fitted with several lugs (10) for handling. Spin Seebeck effect detectors under Reputation 1 or 2 where the shaft (2) is made of alloy with a diameter of 25-40 mm; Spin Seebeck effect detectors under Reputation 1 - 3 where the appropriate hole size in the shaft (2) has a diameter of 20-30 mm and a length of 250-300 mm; Spin Seebeck effect detectors under Reputation 1 - 4 where the wire (1) is a solenoid wire with a size of 0.5-1 mm; Spin Seebeck effect detectors under Reputation 1 - 5 where Mylar sheets (3) have a thickness of 0.5-1 mm. Spin Seebeck effect measuring instrument according to one of the claims 1 - 5, in which the potential difference measuring device (30) is a metal rod 250-300 mm long.